T.E.R:R.A.I.N - Taranaki Educational Resource: Research, Analysis and Information Network


Glossary of Botanical Terms

There are two lists below of Botanical Terms

Thanks to 
http://www.alter-natives.co.nz and Wikipedia, the free encyclopedia

The descriptive clues in botanical names. Some names relate to flower colour, others to habit, and others to origin. Some of the most common terms are listed here, as well as some specially New Zealand botanical terms.

A

• alba white

• albicans becoming white
• albiflorus white flower
• alpina alpine
• angustifolius narrow leaved
• apetala has no petals
• arachnoides spider or spider webs e.g. Sempervivium arachnoideum, the house leek has spider web like appearance
• arboreus or aborescens tree like appearance
• arenaria of sand, referring to plants from sandy places
• argentea or argyraea silver or silvery
• atro dark coloured as in 'atropurpureum'
• attenuata narrows to a point
• aurantica orange
• aurea or aureus gold or golden
• australis southern
• azurea azure or sky blue

B
• banksii named for Sir Joseph Banks, botanist on Captain Cook's voyages
• bellidioides daisy-like appearance, referring to bellis, the daisy
• bicolour two coloured
• bidwillii named for John Bidwill, early New Zealand alpine plant enthusiast
• Brachyglottis short tongued, referring to the short ray florets
• buchananii named for John Buchanan, early New Zealand botanist

C
• caerulea dark blue
• caerulecens bluish, blue tinged
• campanulatus bell shaped
• canadensis of Canada or North-eastern America
• canina of dogs, usually means inferior plant (the Romans were not dog-lovers!)
• cardinalis scarlet, cardinal red
• carnea deep pink
• cataria of cats, eg Nepeta cataria, catmint
• carractae of waterfalls
• chathamicus/chathamica of the Chatham Islands
• chinensis of China
• chlorantha green flowered
• cinerea ash colour, greyish
• coccineum scarlet
• columaris columnar
• colensoi named for William Colenso, early botanist
• confertiflora flowers that are crowded together
• cordata heart shaped
• crassifolius/crassifolia/crassifolium with thick leaves
• cunnihamii named for Allan Cunningham, early botanist

D
• decora beautiful
• delayavi for Abbe Jean Marie Delavay missionary and collector
• dieffenbachii for Dr Ernst Dieffenbach, naturalist
• discolor two different colours
• dissecta deeply cut, usually of a leaf
• downy – having an almost wool-like covering of long hairs
• domestica cultivated
• davidii for Pere Arman David, missionary plant collector
• Dracanena female dragon

E
• Echinops a hedgehog, spiky
• Echium vipers ( a snake)
• Erodium heron's bill, referring to the shape of the seedpods
• excelsa/excelsum/excelsus tall
• eximia exceptional

F
• fibrosa fibrous
• flava clear yellow
• florida flowering
• -florus of flowers
• foetidus smelling, stinking
• -folius of leaves
• forestii for George Forest, Scottish plant collector
• fragrans/fragrantissima fragrant
• frutcosa shrubby
• fulvida tawny coloured

G
• Geranium crane's bill, referring to the shape of the seedpods
• glabrous, glabrate – lacking hairs or trichomes; surface smooth
• gracilis graceful
• graminea grass-like

H
• haastii for Julius von Haast, explorer
• hastata spear shaped
•hirsute – coarsely hairy
•hispid – having bristly hairs
• hookeri for Sir William or Sir Joseph Hooker, directors of Royal Botanic Gardens Kew
• hortensia of gardens
• horizontalis flat, horizontal
• humilis low growing

I
• ilicifolia holly-like (from Ilex or Holly)
• incana grey
• indica of India
• insignis notable
• issima very (as in 'bellissima')
• isophylla equal sized leaves
• ixioides ixia like

J
• japonica of Japan
• jucundum attractive example

K
• kirkii for Thomas Kirk, botanist

L
• laetus/laetum milky
• latifolius/latifolia broad leaved
• lessonii/lessoniana for Pierre Lesson surgeon and botanist
• lineata striped, with lines
• lucida/lucens shining, bright
• lutea yellow
• lutescens becoming yellow
• lyallii for David Lyall, surgeon

M
• macrantha having large flowers
• marcrocarpa having large fruit
• marcophylla having large leaves
• meleagris spotted like a guinea fowl as in Fritillaria meleagris
• melissa honey bee
• microphylla very small leaved
• monroi for Sir David Monro, plant collector
• montana/montanum of the mountains
• moschatum musky scented
• myosotis mouse's ear

N
• nigra black
• novae-zelandiae of New Zealand

O
• officinalis sold as a herb
• orientalis eastern

P
pilose – pubescent with long, straight, soft, spreading or erect hairs
puberulent – minutely pubescent; having fine, short, usually curly, hairs
pubescent – bearing hairs or trichomes of any type
puberulent – minutely pubescent; having fine, short, usually curly, hairs
• paniculata having flowers in panicles
• Pelargonium stork's bill, referring to the shape of the seedpods
• petriei for Donald Petrie, plant collector
• praecox early, of flowering
• procumbens prostrate
• procurrens spreading
• prolifera prolific or free flowering
• prostrata prostrate or lying on the ground
• pumila/pumilo dwarf
• purpurea purple (Echinea purpurea)
• purpurascens purplish, tinged purple

R
• Ranunculus frog, because both like marshy, boggy ground
• recta upright
• reflexa bent backwards
• reptans or repens creeping
• richardii for Achille Richard, French botanist
• rigens/rigida rigid or stiff habit
• roseum rose colour
• rotundata rounded
• rotundifolia having round-shaped leaves
• rubra/rubrum red
• rugosa/rugosum wrinkled
• rupestris growing in rocks

S
• salicina/salicifolia willow like
• sanguinea blood red
• scandens climbing
• serotina late flowering or late ripening
• serpens creeping
• spictata in spikes
• stans/stricta erect or upright
• supine supine or prostrate
strigillose – minutely strigose
strigose – having straight hairs all pointing in more or less the same direction as along a margin or midrib

T
• trigida spotted like a tiger
tomentellous – minutely tomentose
tomentose – covered with dense, matted, woolly hairs

U
• umbellatus flowers appearing to be in umbels
• ursinum a bear, referring to shaggy appearance

V
• vernus of spring
• viridis/virens green
• viridfolius green leaved
• versicolor multi coloured
• vulgaris common
villosulous – minutely villous
villous – having long, soft hairs, often curved, but not matted

Z
• Zebrina zebra, referring to the stripes

Botanical Terms - New Zealand Plant Names

New Zealand plants are special. Many are unique to our island country and found nowhere else in the world.
The descriptive clues in botanical names are rewarding if you translate or understand the terms themselves. The names of our plants reflect their discoverers, place of origin and our history.

A
• Aciphylla the Spaniard for the sharp, needle leaves
• Agathis the kauri, from agathis 'ball of thread' for the distinctive cones
• Arthropodium the rengarenga lily, from 'arthro' a joint and 'podion' stalk (has jointed pedicels)
• Astelia stem-less
• australis southern, as in Cordyline australis

B
• banksii named for Sir Joseph Banks, botanist on Captain Cook's voyages
• bidwillii named for John Bidwill, early New Zealand alpine plant enthusiast
• buchananii named for John Buchanan, early New Zealand botanist

C
• Celmisia mountain daisies, after Celmisios in Greek mythology
• chathamicus/chathamica of the Chatham Islands
• Clianthus kaka beak, from 'kleos' glory and 'anthos' flower for the distinctive flowers
• colensoi named for William Colenso, early botanist
• Coprosma smelling of manure
• Cordyline the cabbage tree, meaning a club as the large and fleshy roots resemble
• Corokia from the Maori name 'Korokio'
• cunnihamii named for Allan Cunningham, early botanist

D
• Dicksonia the tree fern, for James Dickson a Scottish nurseryman and naturalist
• dieffenbachii for Dr Ernst Dieffenbach, naturalist
• Dracophyllum the grass trees, from 'draco' dragon and 'phyllum' leaf

G
• Griselinia the broadleaf, for Franseco Griselini, naturalist

H
• haastii for Julius von Haast, explorer
• Hebe for the Greek Goddess of youth 'Hebe'
• Hoheria for the Moari name 'Houhere'
• hookeri for Sir William or Sir Joseph Hooker, directors of Royal Botanic Gardens Kew

K
• kirkii for Thomas Kirk, early botanist

L
• Leptospermum the manuka, 'leptos' or slender and ' sperma' or seed for the narrow seeds
• lessonii/lessoniana for Pierre Lesson, surgeon and botanist
• lyallii for David Lyall, surgeon

M
• Metrosideros the rata and pohutukawa for their very hard wood; 'metra' heartwood and 'sideros' iron hard
• monroi for Sir David Monro, plant collector
• Muehlenbeckia after Muehlenbeck, a French physician and botanist
• Myosotidium the Chatham Island Forget-me-not, for Myosotis the European forgetme-not

N
• Nothofagus native beech, from 'nothos' false and 'fagus' the beech
• novae-zelandiae meaning 'of New Zealand'

O
• Olearia because it resembles an olive tree (Olea)

P
• Pachystegia the Marlborough Rock Daisy, from 'pakys' or thick for the thick leaves
• Phormium New Zealand flax, from 'phormoin' or a mat, a reference to the traditional Maori weaving of flax and flax fibres
• Pittosporum for the sticky seeds, as 'pitta' means pitch or tar and 'sporum' seeds
• Plagianthus 'plagios' oblique and 'anthhos' flower for the asymmetrical flowers
• Podocarpus the totara, from 'podos' foot and 'karpos' fruit for the stalked fruit
• Pseudopanax lancewoods and the five-finger, from 'pseudo' false and 'panax' a related genus

R
• richardii for Achille Richard, French botanist

S
• sinclairii Andrew Sinclair an early plant collector
• solandri Daniel Solander botanist on the Cook voyages
• Sophora the kowhai, from 'sophera' the Arabic name for a tree with pea shaped flowers

T

• traversii William Travers early plant collector, lawyer and politician
omentose: densely wooly or soft-matted hairiness
tomentulose: like tomentose but less so
torulose: twisted or knobby

W
• williamsii for William Williams, Bishop of Waiapu in the nineteenth century

X
• Xeronema Poor Knights Lily, from 'xeros' dry

Useful words for talking about hairs or hairinessof plants.

acicular: needle-shaped
appressed: lying closely and flatly against the plant's surface
arachnoid: cobwebby
canescent: gray-hairy and hoary
capillary: very slender or hairlike
cespitose: matted or growing in little dense clumps
ciliate: fringed with hairs on the margin
clavate: club-shaped (big at one end)
downy: with very short, weak, soft hairs
echinate: with stout, blunt prickles
ensiform: sword-shaped
glabrous: without hairs
hirsute: with rough hairs
hirtellous: like hirsute but with smaller or more diffuse hairs
hispid: with stiff, bristly hairs
hispidulous: like hispid but with smaller or more diffuse hairs
hoary: closely covered with a white or whitish hairiness
indumentum: a heavy covering or hairiness
lanuginose: woolly or cottony
lanulose: wooly with very short hairs
mucro: a short and abruptly sharp or spiny tip
mucronate: ending with a mucro
pilose: shaggy with soft hairs
plumose: feathery, like the pappus hairs of some composites
puberulent: like pubescent but with smaller hairs
pubescent: downy with short, soft hairs
recurved: bent or curved downward or backward
retrorse: bent or turned backward or downward
septate: divided into partitions
sericeous: silky
setose: covered with bristles
stellate: once or twice forked, or arms radiating from base
strigillose – minutely strigose
strigose – having straight hairs all pointing in more or less the same direction as along a margin or midrib
tomentose: densely wooly or soft-matted hairiness
tomentulose: like tomentose but less so
torulose: twisted or knobby
uncinate: hooked at the tip
velutinous: velvety with erect, straight, moderately firm hairs
villous: shaggy with long, soft, not matted hairs

For more information visit: http://www.nzpcn.org.nz/help_glossary.asp

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Glossary of botanical terms

 

From Wikipedia, the free encyclopedia

A

abaxial

The side away from the axis, for instance the lower surface of a leaf.

abort

To abandon development of a structure of organ.

abscission

(adjective abscissile): A plant's normal shedding of an organ that is mature or aged, e.g. a ripe fruit or an old leaf.

acaulescent

An adjective descriptive of a plant that has no apparent stem, or at least none visible above ground. Examples include some species of Agave, Oxalis and Attalea.[1]

accrescent

Increasing in size with age, such as a calyx that continues to grow after the corolla has fallen, for example in Physalis peruviana.

-aceae

The suffix added to the stem of a generic name to form the name of a family.

achene

A dry 1-seeded indehiscent fruit; e.g. members of the Ranunculaceae.

acicular

Slender or needle-shaped. See Leaf shape.

acropetal

Moving from roots to leaves, e.g. of molecular signals in plants.

acrophyll

The regular leaves of a mature plant, produced above the base; usually in contrast to bathyphyll.

acrostichoid

(describing a type of sorus) covering the entire abaxial surface of the frond, usually densely so, as in Elaphoglossum and Acrostichum.

actinomorphic

regular; radially symmetrical; may be bisected into similar halves in at least two planes. Generally applies to flowers in which the perianth segments within each whorl are alike in size and shape; compare irregular, regular, zygomorphic.

aculeate

Armed with prickles; e.g. the stem of a rose.

acuminate

Tapering gradually to a point.

acute

Sharply pointed; converging edges making an angle of less than 90°; compare obtuse.

adaxial

The side next to the axis; e.g. the upper surface of a leaf.

adnate

Fused to an organ of a different kind; e.g. a stamen fused to a petal; cf. connate.

adventitious

A structure produced in an abnormal position; e.g. an adventitious bud produced from a stem rather than from the axil of a leaf.

adventive

Introduced accidentally (usually referring to weeds).

aerial

Of the air; growing or borne above the surface of the ground.

aestivation

The arrangement of sepals and petals or their lobes in an unexpanded flower bud; cf. vernation arrangement of leaves in a bud.

affinis

With affinity to others, akin to; often used for a provisionally recognized but unnamed taxon considered close to that name, perhaps a hybrid or extreme variant.

aggregate fruit

A cluster of fruits formed from the free carpels of one flower, e.g. blackberry; cf. multiple fruit.

agricultural weed

see weed.

alate

having a wing or wings.

-ales

Suffix to the stem of a generic name or descriptive name to indicate that it applies to a taxon of the rank of order.

alien

Differing in nature, foreign; a plant introduced from elsewhere (exotic, introduced, non-native, non-indigenous).

alkaloid

Molecule with a nitrogenous base, many used as drugs; e.g. morphine, quinine, strychnine.

alternate

(as adjective) leaves or flowers borne singly at different levels along a stem includes spiralled parts; or (as verb) when something occurs between something else, for example stamens alternating with petals; compare opposite.

amphitropous

When the ovule is bent so that both ends are near each other; cf. anatropous, campylotropous, orthotropous.

amplexicaul

With the base dilated and clasping the stem, usually of leaves.

anastomosing

When veins are joined by cross-veins to form a network.

anatropous

When an ovule is inverted so that the micropyle faces the placenta (this is the most common ovule orientation in flowering plants); cf. amphitropous, campylotropous, orthotropous.

androdioecious

Of plants, having bisexual flowers and male flowers on separate individuals; cf. andromonoecious, polygamodioecious, polygamomonoecious, polygamous.

androecium

Male parts of flower; the stamens of a flower collectively; cf. gynoecium.

androgynophore

A stalk bearing both the androecium and gynoecium of a flower above the level of insertion of the perianth.

androgynous

With male and female flowers in the same inflorescence.

andromonoecious

Of plants, having bisexual and male flowers on the same individual; cf. andromonoecious, polygamodioecious, polygamomonoecious, polygamous.

Anemophily

Pollination by wind.

angiosperms

'flowering plants'; plants with developing seeds enclosed in an ovary.

annual

A plant that completes its life cycle and dies within one year.

anterior

Away from the axis; usually abaxial.

anther

Pollen-bearing part of the stamen.

anthesis

Time of flowering; the stage at which the pollen is released from the anthers inside the bud onto the pollen presenter, usually corresponding with flower opening.

antrorse

Directed towards or upwards, e.g. of hairs on a stem; cf. retrorse.

apetalous

Without petals.

apex

(plural apices) The tip; the point furthest from the point of attachment.

apiculate

(Usually referring to a leaf) terminating in a short sharp flexible point; less abrupt than mucronate.

apocarpous

Of a gynoecium consisting with one or more carpels which are free from one another (or almost so); e.g. Ranunculaceae, Dilleniaceae.

apomixis

Reproduction, where viable seed or spores are produced without fertilization. A plant produced in this way is an apomict.

appendage

A secondary part attached to the main structure; an external growth that seldom has any obvious function.

appressed

Pressed closely, but not fused; e.g. leaves against a stem.

aquatic

Plants whose natural habitat is water: living in or on water for all or a substantial part of the organism's life span, generally restricted to fresh or inland waters.

arachnoid

Cobwebby, from being covered with fine white hairs.

arborescent

Tree-like in growth or general appearance.

arboretum

(plural arboreta) A taxonomically arranged collection of trees.

archaeophyte

An non-native plant that has been present in a geographic area for some time; cf. neophyte.

areole

(from areola) A space between the threads of a net; e.g. that part of a leaf surface defined by each of the elements of a vein network; as with cacti, the area between the veinlets of a leaf or the region of a cactus bearing the flowers and/or spines.

aril

(adjective arillate): A membranous or fleshy appendage (formed by expansion of the funicle) which partly or wholly covers a seed; e.g. the fleshy outer layer of lychee fruit and as found in Sapindaceae.

aristate

With a stiff, bristle-like awn or tip.

article

A segment of a jointed stem or of a fruit with constrictions between the seeds; an organ part that separates easily from the rest of the organ at a joint or articulation.

articulate

Jointed; separating freely, leaving a clean scar; for example the fronds of certain ferns where they join the rhizome.

ascending

Spreading horizontally, then becoming erect.

asexual

Of reproduction that does not involve the gametes; i.e. vegetative reproduction.

attenuate

Narrowing gradually.

auricle

(adjective auriculate): Ear-shaped lobe.

awn

Fine bristle-like appendage; e.g. terminating or on the back of glumes and/or lemmas of some grass spikelets.

axil

The upper angle between one part of a plant and another; e.g. the stem and a leaf.

axile

On an axis; of a placenta, on the central axis of the ovary.

axillary

Borne in or arising from the axil of a leaf.

axis

A line passing through the centre of something; it usually refers to the main stem of a whole plant or inflorescence.

B

bark

the protective external layer of tissue on the stems and roots of trees and shrubs; includes all of the living and non-living tissue external to the cambium.

basal

at the base, situated or attached at the base.

basifixed

something attached by its base; e.g. an anther attached to the filament.

basipetal

developing sequentially from the apex towards the base (i.e. with the youngest towards the base); e.g. of flowers in an inflorescence. Also, moving from leaves to roots, e.g. of molecular signals in plants.

bathyphyll

a specialized leaf that is produced at the base of a plant, usually when the plant is immature, and which serves to anchor the plant to a substrate; especially notable in the fern Teratophyllum. (compare: acrophyll).

beak

a pointed projection.

berry

an indehiscent fruit, with the seeds immersed in the pulp, for instance tomato.

biennial

plant which completes its life cycle and dies within the second year; usually also forms a basal rosette of leaves the first year and flowers and fruits the second year.

bifid

forked; cut in two for about half its length.

bifoliate

having 2 leaflets (referring to a compound leaf).

bilabiate

having two lips; e.g. the form of the petals in many irregular flowers.

bilateral

arranged on opposite sides; e.g. leaves on a stem.

biloculate

having two loculi; e.g. in the anthers.

binomial

making use of names consisting of two words to form the scientific name (or combination) in a Latin form. For example, where the first is the name of the genus to which the species belongs, and the second is the epithet given to that species to distinguish it from others in the same genus.

binomial nomenclature

the system of nomenclature in which the scientific name of a species (and not of a taxon at any other rank) is a combination of two names, the first name being the generic name. The second name is referred to botanically as the specific epithet. Note that the two names constitute the species name, not just the second word.

bipinnate

twice pinnate; for example of a compound leaf with individual leaflets pinnately divided.

bipinnatisect

a pinnatisect leaf with deeply dissected segments.

bisexual

bearing both male and female reproductive organs; usually, flowers with both stamens and carpels; hermaphrodite. See Sexual reproduction in plants.

bitegmic

(of an ovule), covered by two integuments.

bole

the trunk of a tree, usually below the lowest branch; cf. canopy.

blade

the lamina or flattened part of a leaf, excluding the stalk.

bloom

a fine white or bluish waxy powder occurring on plant parts, usually stems, leaves and fruits. It is easily removed by rubbing.

bract

modified leaf associated with flower or inflorescence, differing in shape, size or colour from other leaves (and without an axillary bud).

bracteole

small bracts borne singly or in pairs on the pedicel or calyx.

branchlet

a small branch.

bristle

(adjective: bristly) straight stiff hair (smooth or with minute teeth) or upper part of an awn (when the latter is bent and has a lower, stouter, and usually twisted part, called the column).

bryophyte

a botanical group including mosses and liverworts. Technically a classification of plants including three classes: hornworts (Anthocerotae), liverworts (Hepaticae) and mosses (Musci).

bulb

thick storage organ, usually underground, consisting of a stem and leaf bases (the inner ones fleshy).

bulbel

a bulb arising from another bulb.

bulbil

small deciduous bulb or tuber formed in the axil of a leaf or pinna; a means of vegetative propagation.

bulblet

a bulb arising from another bulb; a bulbil.

bullate

surface with rounded or globular blisters.

burr

loosely, a prickly fruit; a rough or prickly propagule consisting of a seed or fruit and associated floral parts or bracts.

buttress root

a root growing from the above-ground stem or trunk, and providing support, as in the case of Ficus macrophylla, the Moreton Bay Fig.

C

caducous

falling off early, for example the sepals of poppies, that fall off when the petals begin to open; compare persistent.

caespitose

tufted; e.g. the growth form of some grasses.

callus

(plural calli) generally, a protruding mass of tissue; in orchids, fleshy outgrowths from the labellum which can be variously shaped from papillae to plates; in grasses, hardened extension from the base of a floret (formed from the rachilla joint and/or the base of the lemma) which may or may not elongate and is often covered in hairs or bristles.

calycophyll

a leaf-like structure formed from a sepal or calyx lobe which enlarges, usually many-fold, before or after anthesis, especially when most of the sepals or calyx lobes retain their original size. More extreme than an accrescent calyx, calycophylls are found in Rubiaceae. cf. semaphyll, pterophyll.

calyculate

having an epicalyx.

calyculus

(1) a cup-shaped structure formed from bracts, (2) in some Asteraceae, a circle of bracts below the involucre.

calyptra

a hood or lid; see operculum.

calyx

(plural calyces) the outer whorl of a flower, usually green; the sepals of one flower collectively.

calyx tube

a tube formed by the fusion of the sepals (calyx), at least at the base.

campanulate

bell-shaped.

campylotropous

when the ovule is oriented transversely (i.e. with its axis at right angles to its stalk) and with a curved embyro sac; cf. amphitropous, anatropous, orthotropous.

canaliculate

channelled; with a longitudinal groove.

canopy

the branches and foliage of a tree; crown; cf. trunk.

capillary

1.  (noun) a tube, pore or passage with a narrow internal cross-section.

2.  (adjective) slender, hair-like.

capitate

with knob-like head; of an inflorescence, with the flowers unstalked and aggregated into a dense cluster; of a stigma, like the head of a pin.

capitulum

a dense cluster of sessile, or almost sessile, flowers or florets; a head.

capsule

a dry fruit formed from two of more united carpels and dehiscing when ripe (usually by splitting into pieces or opening at summit by teeth or pores).

carina

(adjective carinate) see keel.

carpel

a female organ borne at the centre of a flower, consisting of an ovary, a style and a stigma. The gynoecium is the collective term for all the carpels of a single flower.

cartilaginous

hard and tough; gristly.

caryopsis

a dry, indehiscent, one-seeded fruit in which the seed coat is closely fused to the fruit wall, as in most grasses.

casual alien

a plant that appears with no apparent human assistance but does not develop a sustained population(s). Plants that persist only by new introductions; cf. alien.

cataphyll

Early leaf forms of plants or shoots, such as cotyledons, bud-scales, rhizome-scales; anatomically they are leaves, but do not develop to perform the usual functions of photosynthetic leaves.

catkin

a spike, usually pendulous, in which the mostly small flowers are unisexual and without a conspicuous perianth; e.g. willows, poplars, oaks and casuarinas. The individual flowers often have scaly bracts; they are generally wind-pollinated. The catkins are usually shed as a unit.

caudate

having a narrow tail-like appendage.

cauline

borne on an aerial stem, e.g. leaves, flower or fruits (when applied to the latter two organs, usually referring to older stems; = cauliflorous).

cell

1.  basic (microscopic) unit of plant structure, generally consisting of compartments in a viscous fluid surrounded by a wall.

2.  cavity of an anther or ovary.

centrifixed

of a two-branched organ attached by its centre, e.g. a hair, or anther.

chartaceous

with a papery texture.

chamber

cavity of an ovary.

chasmogamous

of flowers that are pollinated when the perianth is open; cf. cleistogamous.

chimera

an individual composed of two or more genetically different tissues, most commonly as a result of a graft and sometimes within the individual, by mutations and irregularities that occur during cell division.

chiropterophilous

pollinated by bats.

chlorophyll

a green pigment in chloroplasts, essential for photosynthesis.

chloroplast

an organelle present in plant cells that contains chlorophyll.

cilia

(singular cilium, adjective ciliate) generally, hairs more or less confined to the margins of an organ, like eye-lashes; in motile cells, minute, hair-like protrusions which aid motility.

circinate (circinnate)

spirally coiled with the tip innermost; e.g. the developing fronds of most ferns.

cladode

a photosynthetic stem, often leaf-like and usually with foliage leaves either absent or much reduced; cf. phyllode.

class

the principal category for taxa in a rank between division and order.

clathrate

latticed or pierced with apertures. In this structures, such as scales, this appearance is caused by thick cell walls between adjacent cells and thin cell walls on the sides of the cells that face the surfaces of the scale.

clavate

club-shaped.

claw

1.  narrow, stalk-like basal portion of petal, sepal of bract.

2.  in Melaleuca, the united portion of a stamen bundle.

cleistogamous

of flowers that self-pollinate and never open fully, or self-pollinate before opening; cf. chasmogamous.

climber

a plant growing more or less erect by leaning or twining on another structure for support.

cline

(adjective clinal) continuous morphological variation in form within a species or sometimes between two species.

clone

plants derived from the vegetative reproduction of an individual, all having the same genetic constitution.

coalescent

plant parts fused or grown together to form a single unit.

coherent

(of like parts) sticking together, but not firmly or solidly as in connate.

colleter

a multicellular, glandular hair that usually produces a mucilaginous substance and is located on sepals, stipules, or petioles, or on nearby parts of stems; commonly found on plants in the order Gentianales.

columella

in flowering plants, the central axis of the cone or fruit, e.g. in Callitris.

column

1.  structure extending above ovary and incorporating the style and stamens; gynostemium; e.g. in orchids.

2.  in grasses, the lower, stouter, and usually twisted part of an awn, distinct from the slender upper part or bristle.

columnar

shaped like a column.

commercial name

a name often of no botanical standing and not governed by the ICNCP. The term generally applies to names such as Trademark Names, names covered by Plant Breeders Rights, Patents and Promotional Names; often used to enhance the sale of a plant.

commissure

the seam or face by which two carpels adhere.

community

an assemblage, in nature, of plants that characteristically occur together.

compound

composed of several parts, for instance a leaf with leaflets, a gynoecium with several carpels, or an inflorescence made up of smaller inflorescences.

compressed

flattened lengthwise, either laterally (from side to side) or dorsally (from front to back).

concolorous

the same colour throughout.

cone

a fruit, usually woody, ovoid to globular, including scales, bracts or bracteoles arranged around a central axis, e.g. in gymnosperms, especially conifers and Casuarina.

conflorescence

of an inflorescence when the overall structure substantially differs from that of the individual branches of the inflorescence, a rarely used term; e.g. the bottlebrush multiple-flower head of callistemons.

connate

fused to another organ (or organs) of the same kind; e.g. petals in a floral tube; cf. adnate.

connective

the part of an anther that connects the anther cells.

connivent

coming into contact or converging.

conspecific

belonging to the same species.

contiguous

adjoining, touching, but not united.

contorted

twisted out of the normal shape.

convolute

referring to the arrangement of floral or foliar organs in a bud when each organ or segment has one edge overlapping the adjacent organ or segment; a form of imbricate arrangement; contorted.

cordate

heart-shaped, with the notch lowermost; of the base of a leaf, like the notched part of a heart.

coriaceous

leathery; stiff and tough, but somewhat flexible.

corm

fleshy, swollen stem base, usually underground, storing food reserves, with buds naked or covered by very thin scales; a type of rootstock. Adjectives derived from "corm" include "cormose" and "cormous".

corolla

collective term for the petals of a flower.

corona

(adjective: coronate) literally, crown

1. in flowering plants, ring of tissue arising from the corolla or perianth of a flower and standing between the perianth lobes and the stamens; e.g. the daffodil trumpet, passionfruit.

2.  in grasses, a hardened ring of tissue surmounting the lemma in some species.

corymb

(adjective corymbose) inflorescence with branches arising at different points but reaching about the same height, giving the flower cluster a flat-topped appearance.

costa

(adjective costate) a rib.

costapalmate

a costapalmate leaf has a definite costa (midrib), unlike the typical palmate or fan leaf, but the leaflets are arranged radially like in a palmate leaf.

cotyledon

primary leaf or leaves of an embryo, becoming the seed leaf or leaves.

crenate

with blunt or rounded teeth, scalloped.

crenulate

minutely scalloped.

crisped

finely curled. A term generally applied to the edges of leaves and petals.

crown

see canopy.

cross

to make something interbreed; the act of hybridization.

cruciform

cross-shaped.

crustaceous

hard, thin and brittle.

cryptogams

ferns, bryophytes, algae and fungi (including lichenized fungi); 'lower plants'; plants producing spores, and without stamens, ovaries or seeds, literally plants whose sexual reproductive organs are not conspicuous cf. phanerogam.

cucullate

from Latin cucullus, a hood. Hood-like or hooded, commonly referring to the shape of leaves or petals. (Example: Pelargonium cucullatum). Similarly derived terms include cuculliform and cuccularis.

culm

in grasses, sedges, rushes, and some other monocotyledons, an aerial stem bearing the inflorescence; strictly, from the base of the plant to the lowest involucral bract (or base of the inflorescence).

cultigen

a plant whose origin or selection is primarily due to intentional human activity.

cultivar

the term cultivar is derived from cultivated variety and denotes an assemblage of cultivated plants clearly distinguished by one or more characters (morphological, physiological, cytological, chemical or other); when reproduced (sexually or asexually), the assemblage retains its distinguishing characters. A cultivar may arise in cultivation or be introduced from the wild. It is a variant of horticultural interest or value. Cultivar names are written with single quotation marks around them e.g. 'Blue Carpet', 'Alba'. All new names established after 1 January 1959, must be in common language (that is, not in Latin) but names established in Latin prior to this date are retained in Latin form.

cultivar epithet

the defining part of a name that denominates a cultivar. Cultivars are designated by fancy (q.v.) epithets appended either to the scientific name or to the common name of the taxon to which they belong; they are not italicized but placed in single quotation marks, for example Rubus nitidoides 'Merton Early'. 'Merton Early' is the cultivar epithet.

cuneate

wedge-shaped; with straight sides converging at base. See Leaf shape.

cupule

a cup-shaped structure composed of coalescent bracts, such as the cup of an acorn.

cupular

shaped like a cupule.

cupulate

bearing cupules.

cupuliform

nearly hemispherical, shaped like a cupola or dome.

cuspidate

tipped with a cusp.

cutting

a piece of plant, usually an apical tip of shoot structure but may be root or leaf, cut from plant and used for vegetative propagation.

cyathium

an inflorescence of unisexual flowers surrounded by involucral bracts, e.g. the flowers of Euphorbia.

cyme

(adjective cymose) inflorescence in which the main axis and all lateral branches end in a flower (each lateral may be repeatedly branched).

cypsela

a dry, indehiscent, one-seeded fruit formed from an inferior ovary.

D

deciduous

falling seasonally, for instance bark, leaves, petals; persistent.

decorticate

to shed or peel off the outer bark of a tree.

decumbent

with branches growing horizontally but turned up at the ends.

decurrent

extending downwards beyond the point of exsertion, e.g. when the base of a leaf is prolonged downwards along the stem in a raised line or narrow wing.

decussate

opposite, with successive pairs borne at right angles to the last; generally applied to the arrangement of leaves.

definite

of a constant number; e.g. twice as many stamens as the petals or sepals (or less), or an inflorescence ending in a flower or an aborted floral bud, typically a cymose inflorescence; cf. indefinite.

deflexed

bent downwards; compare inflexed.

dehiscent

breaking open at maturity to release contents. Generally refers to the release of seed from some fruits; also pollen from anthers.

deltoid

with the shape of the Greek letter, i.e. like an equilateral triangle. See Leaf shape.

dendroid

tree-like, branching like a tree.

dentate

toothed. See Leaf margin.

denticulate

finely toothed.

determinate

limited, usually in growth.

dichasium

a cymose inflorescence with all branches below the terminal flower in regular opposite pairs; compare monochasium.

dichotomous

forking into two equal branches, resulting from an equal division of the growing tip. Typically refers to mode of branch growth, as in Aloe dichotoma, but also to other organs, such as the thorns of various species of Carissa (which morphologically are branches) and thalli or hyphae of various algae and fungi.

dicotyledon

a flowering plant whose embryo has two (rarely more) cotyledons (seed leaves) (common usage: dicot.) compare monocotyledon (common usage: monocot.).

digitate

with segments spreading from a common centre, like the fingers of a hand; see also palmatisect.

dimorphic (dimorphous)

of 2 different kinds (in respect to shape and/or size), for example of stamens, fronds, leaves.

dioecious

of plant, when male and female reproductive structures develop on different individuals; of infloresence, male and female flowers in separate infloresences; cf. monoecious.

diploid

with two full sets of chromosomes in the nucleus of a cell; having two complements of haploid chromosomes, that is the two complete sets of chromosomes, one from each of the parental gamete. This is expressed symbolically as 2n, where n = the gamete number of chromosomes.

disk (disc)

a plate or ring of structures derived from the receptacle, and occurring between whorls of floral parts: in daisies, the central part of capitulum, hence disk flowers or florets.

discolorous

of leaves, with upper and lower surfaces of a different colour.

disjunct

occurring in widely separated geographic areas, distinctly separate; applies to a discontinuous range in which one or more populations are separated from other potentially interbreeding populations far enough as to preclude gene flow between them.

dissected

deeply divided; cut into many segments.

distal

remote from the point of origin or attachment; the free end; cf. proximal.

distichous

arranged in two opposite rows (and hence in the same plane).

distinct

separate or free, not united.

diurnal

of the day; occurring or opening in the daytime.

divaricate

wide-spreading.

divergent

spreading in different directions, generally upward.

division

the term used for the rank below kingdom in the taxonomic hierarchy.

 

 

Leaves of Epipremnum pinnatum have a drip tip

domatia

pits formed at the junction of two veins on the undersurface of leaves (mostly of rainforest plants); often modified appendages that shelter parasites and other micro-organisms.

dorsal

the back; at the back; in particular, away from the axis in a lateral organ or away from the substratum in a prostrate plant.

dorsifixed

attached at or by the back, e.g. anthers on a filament.

dorsiventral

having structurally different upper and lower surfaces, e.g. some leaves.

drip tip

a long narrow extension at the apex of a leaf or leaflet.

drupe

a succulent fruit formed from one carpel; the single seed is enclosed by a stony layer of the fruit wall; kernel; e.g. peaches, olives and the fruit of Nitraria billardieri.

E

ecological amplitude

the range of environmental conditions in which an organism can survive.

elaisome

oily body attached to the seed.

ellipsoid

a 3-dimensional shape, elliptical in all sections through the long-axis.

elliptical (elliptic)

planar, shaped like a flattened circle, symmetrical about both the long and the short axis; about twice as long as broad, tapering equally both to the tip and the base; oval.

emarginate

notched at apex (notch usually broad and shallow).

embryo

young plant contained by a seed.

enantiostyly

the condition in which the gynoecium protrudes laterally, to the right (dextrostyly) or to the left (sinistrostyly) of the androecium. example: Senna.

endemic

having a natural distribution restricted to a particular geographic region; cf. native.

endocarp

the innermost layer of the wall of a fruit; in a drupe, the stony layer surrounding the seed.

endosperm

nutritive tissue in a seed; albumen.

ensiform

shaped like the blade of a sword.

entire

1.  not divided.

2.  (of a margin) having a smooth margin, not lobed or toothed (it may be wavy or scalloped).

ephemeral

short-lived.

 

 

The enlarged calyx and smaller epicalyx of Hibiscus sabdariffa

epicalyx

an involucre resembling an outer calyx; e.g. as seen in Hibiscus.

epicarp

the outer layer of the wall of a fruit, i.e. the 'skin'.

epicormic

said of buds shoots or flowers developing from the old wood of trees, especially after injury or fire.

epicotyl

the part of the plant axis or stem between the cotyledonary node and first foliage leaves.

epidermis

an organ's outermost layer of cells, usually only one cell thick.

epigynous

borne on the ovary; describes floral parts when attached above the level of the ovary and arising from tissue fused to the ovary wall; cf. hypogynous, perigynous.

 

 

An epilithic lichen

epilithic

growing on stone; compare lithophytic, a plant growing on stone.

epipetalous

of stamens that are attached to the petals.

epiphytic

see lithophytic.

epitepalous

of stamens that are attached to the tepals.

epiphyte

(adjective epiphytic) one plant growing on another without deriving nourishment from it (in other words, not parasitic); compare parasite. Loosely, and incorrectly, applied to plants that are not terrestrial (they may grown on various inorganic or organic surfaces), and often to orchids, which are rock-dwelling (and therefore strictly lithophytic).

epithet

the adjectival component in a binomial; final word or combination of words in a name of more than one word (other than a term denoting rank) that denominates an individual taxon.

equitant

of a leaf when folded lengthwise with edges adhering except at the base, where it clasps another leaf on the opposite side of the stem.

erect

upright, more or less perpendicular to the ground or point of attachment.

ericoid

with leaves like the European heath (Erica), small and sharply pointed.

erose

with the margin irregular as though nibbled or worn away.

even-pinnate

having an even number of leaflets in a compound leaf, = paripinnate.

evergreen

not deciduous, having leaves all the year round.

ex

in nomenclature, indicating that the preceding author proposed the name but did not legitimately publish it, and that the succeeding author referred to the first author when legitimately publishing the name. See Author citation (botany).

exocarp

the outer layer of the pericarp, often the skin of fleshy fruits.

exotesta

the outer layer of the testa (seed coat). It is derived from the outer integument of the ovule.

exotic

not native; introduced from another region or country.

exserted

projected beyond, e.g. the stamens beyond the corolla tube.

exstipulate

without stipules.

extrastaminal

outside the stamens or androecium, usually referring to the location of a nectary disk.

extrorse

of anther locules, opening towards the outside of the flower; cf. introrse, latrorse.

F

F1 hybrid

a single cross; a plant breeding term for the result of a repeatable cross between two pure bred lines.

F2 hybrid

a plant breeding term for the result of a plant arising from a cross between two F1 hybrids; may also refer to self-pollination in a population of F1 hybrids.

facultative

of parasites, optional; compare obligate.

falcate

curved like the blade of a scythe.

family

a formal group of one or more genera with features and/or ancestry in common; the term for the principal rank between order and genus.

fascicle

(adjective fasciculate) cluster, e.g. a tuft of leaves all arising from the same node.

fastigiate

parallel, clustered and erect, e.g. the arrangement of branches in the Lombardy Poplar.

felted

covered with very dense, interlocked and matted hairs with the appearance or texture of felt or woollen cloth.

ferruginous

rust-colored.

fertile

capable of producing fruit; of flowers when they produce seed or of anthers containing pollen.

fertilization

union of male and female gametes.

filament

1.  stalk of a stamen

2.  thread, one or a few cells thick.

filamentous

consisting of filaments or fibres.

filiform

thread-like. See Leaf shapes.

fimbriate

fringed.

fissure

a split or crack, often referring to fissured bark. also, a line or opening of dehiscence.

flabellate

fan-shaped.

flaccid

limp; tending to wilt; compare turgid.

flexuous (flexuose)

bent alternately in different directions; zig-zag.

floccose

with a soft and woolly covering of hairs.

flora

1.  all the plants growing in a certain region or country.

2.  an enumeration of them, generally with a guide to their identification (e.g. the present volume, the Flora of Victoria, the Flora of New South Wales and so on). In this case 'flora' is written with a capital F.

floral leaves

the upper leaves at the base of the flowering branches.

floral tube

tube bearing the perianth and stamens, consisting of tissue derived from the receptacle and/or perianth and/or stamens; hypanthium.

floret

literally a small flower, but usually refers to the individual true flowers clustered within an inflorescence, particularly in inflorescences of the daisy and grass families.

flower

the sexual reproductive structure of the angiosperms, typically with a gynoecium, androecium, perianth and an axis.

follicle

a dry fruit formed from one carpel, splitting along a single suture, to which the seeds are attached; cf. pod (of legume).

forb

any non-woody flowering plant that is not a grass, sedge, or rush.

forest

vegetation dominated by trees with single trunks (including closely arranged trees with or without an understorey of shrubs and herbs).

forma (in common usage, form)

a taxonomic category subordinate to species and within the taxonomic hierarchy, below variety (varietas), usually differentiated by a minor character.

free

not united with others organs of the same type; not attached at one end.

free central

of placentation, ovules attached to a free-standing column in the centre of a unilocular ovary.

frond

a leaf of a fern, cycad or palm.

fruit

seed-bearing structure in angiosperms formed from the ovary, and sometimes associated floral parts, after flowering.

funicle (funiculus)

the stalk of an ovule.

funnelform

with a form gradually widening from the base to apex; funnel-shaped.

fused

joined together.

fusiform

3-dimensional, narrowing gradually from the middle towards each end; spindle-shaped.

G

galbulus

(in gymnosperms) a fleshy cone (megastrobilus); chiefly relates to those borne by junipers and cypresses and often mistakenly called berries.

gamete

(in ferns, gymnosperms and angiosperms) a cell or nucleus that fuses with another of the opposite sex in sexual reproduction.

gametophyte

plant that bears gametes; in ferns, usually a small but discrete plant very different from the sporophyte (which is normally considered the fern plant); in gymnosperms and angiosperms, a microscopic structure (part of the reproductive apparatus) not recognizable as a discrete plant.

gene pool

the range of genetic variation found in a population.

genus

(plural genera) a group of one or more species with features or ancestry (or both) in common. Genus is the principal category of taxa intermediate in rank between family and species in the nomenclatural hierarchy.

generic name

the name of a genus, for example Acacia, Eucalyptus.

genotype

the genetic make-up of an individual.

germination

1.  of seeds, describing the complex sequence of physiological and structural changes that occur from resting to growth stage.

2.  of a pollen grain; production of a pollen tube when contacting a stigma receptive to it.

3.  of a spore of fungi/bacterium; change of state – from resting to vegetative.

gibbous (gibbose)

when part of an organ is swollen; usually with a pouch-like enlargement at base.

glabrescent

becoming glabrous, almost glabrous.

glabrous

without surface ornamentation such as hairs, scales or bristles.

gland

a secretory structure within or on the surface of a plant; (loosely) a smooth, usually shining, bead-like outgrowth.

glandular hair

hairs tipped with a gland.

glaucous

with a whitish bloom, blue-green in colour; e.g. the surface of the young leaves of many eucalypts.

globose (globular)

nearly spherical.

globulose

small or nearly spherical.

glochid

a barbed hair or bristle, e.g. the fine hairs in Opuntia.

glumes

bracts subtending the floret(s) of a sedge, or similar plant; in grasses forming the lowermost organs of a spikelet (there are usually 2 but 1 is sometimes reduced; or rarely, both are absent).

glutinous

sticky.

graft

1.  of a plant, the artificial union of plant parts.

2.  a plant shoot suitable for grafting; loosely means a scion, sucker, or branch.

3.  an old word for a spade's depth of soil.

4.  a kind of spade used for digging drains.

graft chimaera (sometimes graft hybrid)

a taxon whose members consist of tissue from two or more different plants in intimate association originated by grafting. The addition sign "+" is used to indicate a graft-chimaera either as a part of a formula (e.g. Crataegus monogyna + Mespilus germanica), or in front of an abbreviated name (e.g. +Crataegomespilus 'Dardari'). The nomenclature of graft hybrids is governed by the International Code of Nomenclature for Cultivated Plants.

granular

of a surface, covered with small rounded protuberances.

grass

a plant belonging to the family Poaceae.

grassland

low vegetation dominated by grasses.

groundcover

1.  of a plant, with a very flat and soil-hugging habit.

2.  a term applied to describe a plant that covers the soil surface so densely that it smothers all beneath it.

Group

a formal category equivalent to or below the rank of genus. It distinguishes:

1. an assemblage of two or more cultivars within a species or hybrid.

2.  plants derived from a hybrid in which one or more of the parent species is not known or is of uncertain origin.

3.  a range of cultivated plants of a species or hybrid which may exhibit variation but share one or more characters, which makes it worth distinguishing them as a unit.

Guard cell

each of the two cells that surround the stoma and allow gas exchange from the apoplast of the plant to the external air.

gymnosperm

a seed-bearing plant with ovules borne on the surface of a sporophyll; includes, among others, conifers, Ginkgo, Gnetum and cycads.

gynobasic

of a style, arising near the base of the gynoecium, e.g. between the lobes of the ovary.

gynoecium

female parts of flower; the collective term for the carpels of a flower whether united or free; cf. pistil; androecium.

gynophore

stalk supporting the gynoecium (above the level of insertion of the other floral parts).

H

habit

the general external appearance of a plant, including size, shape, texture and orientation.

habitat

the place where a plant lives; the environmental conditions of its home.

hair

a single elongated cell or row of cells borne on the surface of an organ.

half-inferior

of ovary, partly below and partly above the level of attachment of the other floral parts; compare inferior, superior.

halophyte

a plant adapted to living in highly saline habitats; a plant that accumulates high concentrations of salt in its tissues.

hand-pollination

the controlled act of pollination that excludes the possibility of open-pollination.

haploid

of chromosomes, and relative to the phase of an alternation of generations in which the duplicated chromosome set or diploid condition is reduced; the condition when the chromosomes are not duplicated, e.g. the complement of chromosomes in the nucleus of a gamete; a single basic set of chromosomes in the nucleus of a cell. This may be expressed symbolically as n, where n = the gamete number of chromosomes.

hastate

like the head of a halbert, i.e. narrow and pointed but abruptly enlarged at the base into two acute diverging lobes; may refer only to the base of a leaf with such lobes; cf. sagittate.

haustorium

in parasitic plants, a structure developed for penetrating the host's tissues.

head

see capitulum.

heathland

vegetation dominated by small shrubs which usually have ericoid leaves.

helicoid

coiled; of a cymose inflorescence, when the branching is repeatedly on the same side (the apex is often recurved); cf. scorpioid.

herb

a vascular plant that does not develop a woody stem; e.g. a violet.

herbaceous

not woody; usually green, and soft in texture.

herbarium

a collection of preserved, usually dried, plant material. Also a building in which such collections are stored.

hermaphrodite

see bisexual.

heteromorphic

of 2 or more distinct morphologies (e.g. of different size and shape).

hilum

the scar on a seed coat where it separates from its stalk (funicle).

hip

the fruit of a rose.

hippocrepiform

horseshoe-shaped.

hirsute

bearing coarse, rough, longish hairs. See Indumentum.

hispid

having long erect rigid hairs or bristles, harsh to touch.

hoary

covered with a greyish to whitish layer of very short, closely interwoven hairs, giving a frosted appearance.

holotype

a type chosen by the author of a name; cf. a lectotype, which is chosen by a later author.

hyaline

translucent; usually delicately membranous and colourless.

hybrid

a plant produced by the crossing of parents belonging to two different named groups, e.g. genera, species, varieties, subspecies, forma and so on; i.e. the progeny resulting within and between two different plants. An F1 hybrid is the primary product of such a cross. An F2 hybrid is a plant arising from a cross between two F1 hybrids (or from the self-pollination of an F1 hybrid).

hybrid formula

the names of the parents of a hybrid joined by a multiplication sign, e.g. Cytisus ardonoi × C. purgans.

Hydrophily

a fairly uncommon form of pollination whereby pollen is distributed by the flow of waters.

hypanthium

see floral tube.

hypogynous

borne below the ovary; used to describe floral parts inserted below the ovary's level of insertion; cf. epigynous, perigynous.

hypocotyl

of an embryo or seedling, the part of the plant axis below the cotyledon and node, but above the root. It marks the transition from root to stem development.

hypocarpium

an enlarged fleshy structure that forms below the fruit, from the receptacle or hypanthium.

I

illegitimate name (nomen illeg.)

a name not abiding by the rules of the botanical Codes, e.g. later homonyms, cultivars that have been Latinised after 1 Jan 1959; cultivar names with more than 10 syllables or 30 letters; cultivar names that use confusing names of other plants, e.g. Camellia 'Rose'.

imbricate

overlapping each other; of perianth parts, edges overlapping in the bud (the convoluted arrangement is a special form of imbrication).

imparipinnate

a pinnate leaf with an odd number of pinnae (terminated by a single leaflet); compare paripinnate.

in

in nomenclature, where the preceding author published the name in an article or book, authored or edited by the succeeding author.

inbreeding

the production of offspring between closely related parents leading to a high degree of similarity; self-fertilization is the most intense form of inbreeding.

incised

cut deeply and (usually) unevenly (a condition intermediate between toothed and lobed).

included

enclosed, not protruding; for example stamens within the corolla.

incurved

bent or curved inwards; of leaf margins, when curved towards the adaxial side.

ined.

abbreviation of Latin inedita, an unpublished work. Used to indicate that a botanical name appeared only in a manuscript that was not published, so the name is invalid.

indefinite

variable in number; numerous; e.g. more than twice as many stamens as petals or sepals, or when an inflorescence is not terminated by a flower (and continues growing); cf. definite.

indehiscent

not opening in any definite manner at maturity; usually referring to fruit.

indeterminate

unlimited, usually in growth.

indigenous

native to the area, not introduced, and not necessarily confined to the region discussed or present throughout it (hardly distinct from ‘native’ but usually applied to a smaller area). For example, the Cootamundra Wattle is native to Australia but indigenous to the Cootamundra region of southern New South Wales; cf. endemic.

indumentum

any surface covering, e.g. hairs, scales; a collective term for such coverings.

indusium

1.  a membrane covering the sporangia of some ferns.

2.  a cup enclosing the stigma in Goodeniaceae.

inferior

of an ovary, at least partly below the level of attachment of other floral parts; compare superior.

inflated

swollen, like a bladder.

inflexed

bent sharply upwards or forwards; compare deflexed.

inflorescence

several flowers closely grouped together to form an efficient structured unit; the grouping or arrangement of flowers on a plant.

infraspecific

denotes taxonomic ranks below species level, for example subspecies.

infructescence

the grouping or arrangement of fruits on a plant.

infundibular (infundibularform)

funnel-shaped, for example in the corolla of a flower..

inrolled

rolled inwards.

insectivorous

catching, and drawing nutriment from, insects.

integument

in general, any covering, but especially the covering of an ovule.

interjugary glands

in pinnate leaves, glands occurring along the leaf rachis between the pinnae (occurring below the single, and often slightly larger, gland at or just below the insertion of the pinnae); cf. jugary.

internode

the portion of a stem between two nodes.

interpetiolar

of stipules, between the petioles of opposite leaves.

intramarginal

inside but close to the margin, for example a vein in a leaf.

intrastaminal

inside the stamens or androecium, usually referring to the location of a nectary disk.

introrse

of anther locules, with opening towards the centre of flower (at least in bud); cf. extrorse, latrorse.

invalid

use of names not validly published according to the Code; i.e. they are not strictly 'names' in the sense of the International Code of Botanical Nomenclature.

involucre

a group of bracts surrounding the base of a flowerhead; e.g. as seen in a daisy.

involute

rolled inwards, for example when the margins of a leaf are rolled towards the adaxial (usually upper) surface; compare revolute.

irregular

cannot be divided into two equal halves through any vertical plane; compare zygomorphic, actinomorphic, regular.

isobifacial

(of flat structures, especially leaves) with both surfaces similar, usually referring to cell types or to the number and distribution of stomata.

J

joint

a node or junction of two parts; articulation.

jugary

of glands, gland occurring on the rachis of a bipinnate leaf at the junction or attachment of pairs of pinnae or pinnules, as in some Acacia species; cf. interjugary.

juvenile leaves

formed on a young plant and different in form from the adult leaves.

K

keel

a ridge like the keel of a boat, e.g. the structure formed by the fusion of the two anterior petals of a flower in the Fabaceae.

kernel

see drupe.

kingdom

the highest generally employed category of the taxonomic hierarchy, above that of division (phylum).

L

labellum

lip; one of three or five petals which is (usually) different from the others, e.g. in Orchidaceae and Stylidiaceae.

labiate

lipped; where the limb of a corolla is divided into two parts, called an upper and lower lip, the two resembling an open mouth with lips.

lacerate

jagged, as if torn.

laciniate

slashed into narrow, pointed lobes.

lamella

(plural lamellae, adjective lamellate) a thin, plate-like layer.

lamina

the blade of a leaf or the expanded upper part of a petal, sepal or bract.

lanceolate

about four times as long as broad, broadest in the lower half and tapering to the tip; narrowly ovate (sometimes, and incorrectly, used to mean narrowly elliptic; like a lance head).

lateral

attached to the side of an organ, e.g. leaves on a stem.

latex

a milky substance that exudes from such plants such as milk thistles, figs and dandelions.

latrorse

a type of anther dehiscence in which the anthers open laterally toward adjacent anthers. cf. introrse, extrorse.

lauroid

resembling Laurus, the laurel genus, particularly its leaves.

lax

loose, not compact.

leaf

an outgrowth of a stem, usually flat and green; its main function is food manufacture by photosynthesis.

leaf gap

a parenchymatous area in the stele above (distal to) a leaf trace.

leaf trace

a vascular strand connecting the stele to a leaf.

leaflets

the ultimate segments of a compound leaf.

legume

1.  a fruit characteristic of the families Mimosaceae, Caesalpiniaceae and Fabaceae, formed from one carpel and either dihiscent along both sides, or indehiscent.

2.  a crop species in the family Fabaceae.

3.  a plant belonging to the Leguminosae (Fabaceae family).

lemma

the lower of 2 bracts enclosing a grass flower.

lenticel

a loosely packed mass of cells in the bark of a woody plant (used for gas exchange), visible on the surface as a raised powdery spot.

lepidote

covered with small scurfy scales.

liana

a woody climbing plant, rooted in the ground (both liane and liana are used).

liane

a woody climbing plant, rooted in the ground.

ligneous

woody

lignotuber

a woody swelling of the stem below or just above the ground; contains adventitious buds from which new shoots can develop, e.g. after fire.

ligulate

1.  bearing a ligule.

2.  strap-shaped.

ligule

1.  small membranous appendage on the top of the sheath of grass leaves.

2.  a minute adaxial appendage near the base of a leaf, e.g. in Selaginella.

3.  extended, strap-like corolla of some daisy florets.

linear

very narrow in relation to its length, with the sides mostly parallel. See Leaf shape.

lithophytic

a plant growing on rocks; an epilithic plant.

lobe

part of a leaf (or other organ), often rounded, formed by incisions to about halfway to the midrib.

loculicidal

of a fruit, when it dehisces through the centres of loculi; cf. septicidal.

loculus

a chamber or cavity, for example, within an ovary or anther.

lomentum

a pod-like indehiscent fruit that develops constrictions between the segments and at maturity breaks into one-seeded segments.

lunate

crescent-shaped.

lyrate

lyre-shaped; deeply lobed, with a large terminal lobe and smaller lateral ones.

M

Macaronesia

a biogeographic area encompassing the islands off the coast of NW Africa and Europe, including the Azores, Canaries, Cape Verde Islands and Madeira.

Malaysia

Malay peninsula and North Borneo.

Malesia

a biogeographic region comprising Malaysia, Indonesia, New Guinea, and the Philippines.

mallee

growth habit in which several woody stems arise separately from a lignotuber; a plant with such a growth habit; vegetation characterized by such plants.

mangrove

a shrub or small tree growing in salt or brackish water, usually characterized by pneumatophores.

margin

the edge, as in the edge of a leaf blade.

marginal

occurring at or very close to the margin.

marsh

a waterlogged area; swamp.

mast

the edible vegetative or reproductive part produced by woody species of plants, i.e. trees and shrubs, that wildlife species and some domestic animals consume.

mealy

covered with coarse, floury powder, sometimes due to collapsed hairs.

megaspore

the larger of two kinds of spores produced by a heterosporous plant giving rise to the female gametophyte; compare microspore.

megastrobilus

the larger of two kinds of cones or strobili produced by gymnosperms, being female and producing the seeds; compare microstrobilus.

membranous

thin, translucent and flexible, seldom green.

mericarp

one segment of a fruit (a schizocarp) that splits at maturity into units derived from the individual carpels, or a carpel, usually 1-seeded, released by the break-up at maturity of a fruit formed from 2 or more joined carpels.

meristem

a group of actively dividing tissues.

mesic

moist, avoiding both extremes of drought and wet; pertaining to conditions of moderate moisture or water supply; applied to organisms (vegetation) occupying moist habitats.

mesocarp

the fleshy portion of the wall of a succulent fruit inside the skin and outside the stony layer (if any), surrounding the seed(s); sarcocarp.

mesomorphic

soft and with little fibrous tissue, but not succulent.

mesophyll

1.  mesophyll tissue, photosynthetic tissue of a leaf, the central tissues between the upper and lower epidermis.

2.  in ecology, the blade of a leaf or leaflet that has a surface area 4500–18225 mm2; A plant, or vegetation, that has mesophyll (sized) leaves.

mesophyllous

(of vegetation) of moist habitats and having mostly large and soft leaves.

mesophyte

a plant thriving under intermediate environmental conditions of moderate moisture and temperature, without major seasonal fluctuations.

microspore

the smaller of two kinds of spores produced by a heterosporous plant; compare megaspore.

microstrobilus

the smaller of two kinds of cones or strobili produced by gymnosperms, being male and producing the pollen; compare megastrobilus.

midrib

the central, and usually most prominent, vein of a leaf or leaf-like organ; midvein.

midvein

see midrib.

monad

a single individual that is free from other individuals, not united with them into a group. The term is usually used for pollen to distinguish single grains from tetrads or polyads.

moniliform

resembling a string of beads.

monochasium

a cymose inflorescence with the branches arising singly; cf. dichasium.

monocots

abbreviation of monocotyledons.

monocotyledon

a flowering plant whose embryo has one cotyledon (seed leaf); compare dicotyledon.

monoecious

of vascular plants, where the male and female reproductive structures are in separate flowers but on the same plant; of inflorescence, including unisexual flowers of both sexes; cf. dioecious.

monograph

of a group of plants, a comprehensive treatise presenting an analysis and synthesis of taxonomic knowledge of that taxon; the fullest account possible (at the time) of a family, tribe or genus. It is generally worldwide in scope and evaluates all taxonomic treatments of that taxon including studies of its evolutionary relationships with other related taxa, and cytological, genetic, morphological, palaeobotanical and ecological studies. The term is often incorrectly applied to any systematic work devoted to a single taxon. Compare revision.

monotypic

containing only one taxon of the next lower rank, e.g. a family with only one genus, or a genus that includes only a single species.

morphology

the shape or form of an organism or part thereof.

mucro

a sharp, short point, generally at the tip of a leaf or the tip of the midrib of a compound leaf. Diminutive: mucronule.[2]

mucronate

terminating in a mucro.

multiple fruit

a cluster of fruits produced from more than one flower and appearing as a single fruit, often on a swollen axis, as in Moraceae; cf. aggregate fruit.

muricate

covered with short hard protuberances.

mutation

an abrupt and inexplicable variation from the norm, such as the doubleness in flowers, changes in colour, or habit of growth.

N

native

naturally occurring in an area, but not necessarily confined to it; cf. endemic.

natural hybrid

a hybrid taxon produced by chance in the wild.

naturalised

describing a plant, introduced from another region, that grows and reproduces readily in competition with the natural flora.

nectar

a (usually sweet) fluid produced by the flowers of many plants, collected by bees and other insects.

nectary

(adjective nectariferous) a specialized gland that secretes nectar.

neophyte

a plant that was recently introduced to a geographic area; cf. archaeophyte.

nerve

see vein.

New World

the Americas.

node

the part of a stem where leaves or branches arise.

nomen conservandum

(Latin) a name which although, contrary to the rules of nomenclature (usually a later synonym), must be adopted.

nomen illegitimum

(Latin) see illegitimate name, a name that is superfluous at its time of publication either because the taxon to which it was applied already has a name, or because the name has already been applied to another plant.

nomen invalidum

(Latin) a name that is not validly published. (Abbreviation: nom. inval.)

nomen nudum

(Latin) a name not published in accordance with the International Code of Nomenclature for algae, fungi, and plants, usually without a diagnosis or description of the entity to which it applies, and without reference to either; such a name should not be used.

nomenclature

the naming of things; often restricted to the correct use of scientific names in taxonomy; a system that sets out provisions for the formation and use of names.

noxious

of plants, containing harmful or unwholesome qualities. Applied in conjunction with 'weed' to specifically describe a plant which legislation deems harmful to the environment. Each state and territory in Australia has specific legislation governing noxious weeds.

numerous

Stamens are described as numerous when there are more than twice as many as sepals or petals.

nut

a hard, dry, indehiscent fruit, containing only one seed.

nutlet

a small nut, one of the lobes or sections of the mature ovary of some members of the Boraginaceae, Verbenaceae, and Lamiaceae.

O

ob-

inversely; usually same shape as suffix but attached by the narrower end, for example obcordate, oblanceolate, obovate.

obconic

of a fruit, hypanthium, pistil or calyx structure; an inverted cone shape.

obcordate

of a leaf blade, broad and notched at the tip; heart shaped but attached at the pointed end.

oblanceolate

a 2-dimensional shape, lanceolate but broadest in the upper third; cf. lanceolate.

obligate

of parasites, unable to survive without the host; compare faculative.

oblique

slanting; of a leaf, larger on one side of the midrib than the other, in other words asymmetrical.

oblong

length a few times greater than width, with sides almost parallel and ends rounded.

obovate

of a leaf, a 2-dimensional shape of which the length is about 1.5 times the width, and widest above the centre.

obtuse

blunt or rounded at the tip or apex; converging edges making an angle of more than 90°; compare acute. See Leaf shape.

Oceania

the islands of the Pacific (sometimes including Australia).

ocrea (ochrea)

a sheath, formed from two stipules, encircling the node in Polygonaceae.

odd-pinnate

(imparipinnate) having an odd number of leaflets in a compound leaf.

Old World

the world known before the discovery of America; essentially Europe and Asia.

olim

formerly, e.g., "olim B", formerly in the Berlin herbarium (Herbarium Berolinense).

ontogeny

the sequence of developmental stages through which an organism passes.

operculum (calyptra)

a lid or cover that becomes detached at maturity, e.g. in Eucalyptus, a cap covering the bud and formed by the fusion or cohesion of perianth parts.

opposite

(as adjective) leaves or flowers borne at the same level but on opposite sides of the axis; or (as verb) when something occurs on the same radius as something else, for example anthers opposite sepals; compare alternate.

opera utique oppressa (plural), and opus utique oppressum (singular)

listed after the botanical name of a plant, or the name of a publication, this indicates that a publication is listed in the International Code of Nomenclature for algae, fungi, and plants as a suppressed work. Botanical names of the specified rank in the publication are considered not validly published (article 32.9).

orbicular

flat and more or less circular.

order

a group of one or more families sharing common features, ancestry, or both.

ortet

the original single parent plant from which a clone ultimately derives.

orthotropous

when an ovule is erect, with the micropyle directed away from the placenta; atropous; cf. amphitropous, anatropous, campylotropous.

oval

see elliptical.

ovary

the basal portion of a carpel or group of fused carpels, enclosing the ovule(s).

ovate

shaped like a section through the long-axis of an egg and attached by the wider end.

ovoid

egg-shaped, with wider portion at base; 3-dimensional object, ovate in all sections through long-axis.

ovule

loosely, the seed before fertilization; a structure in a seed plant within which one or more megaspores are formed (after fertilization it develops into a seed).

P

pachycaul

with a disproportionately thick trunk

pachycladous

with disproportionately thick stems

palea

(plural paleae)

1. the upper of 2 bracts enclosing a grass flower, major contributors to chaff in harvested grain.

2.  Chaffy scales on the receptacles of many Asteraceae.

3.  Chaffy scales on the stipe of many ferns.

paleate

bearing paleae or chaffy scales, as in description of the receptacle of a capitulum of a plant in the Asteraceae.

paleaceous

Chaff-like in texture.

palmate

1.  a compound leaf divided into several leaflets arising from the same point at the top of the petiole.

2.  of veins in a simple leaf when they arise in a similar fashion.

palmatifid

deeply divided into several lobes arising from more or less the same level.

palmatisect

intermediate between palmate and palmatifid, i.e. the segments are not fully separated at the base; often more or less digitate.

panicle

(adjective paniculate) a compound raceme; an indeterminate inflorescence in which the flowers are borne on branches of the main axis or on further branches of these.

papilionate

butterfly-like; with a corolla like that of a pea.

papilla

(plural papillae, adjective papillose) a small, elongated protuberance on the surface of an organ, usually an extension of one epidermal cell.

pappus

in daisy florets, a tuft or ring of hairs or scales borne above the ovary and outside the corolla (representing the missing calyx); a tuft of hairs on a fruit.

parasite

an organism living on or in a different organism, from which it derives nourishment; compare saprophyte, epiphyte.

parietal

attached to the marginal walls of a structure, for example ovules attached to placentas on the wall of the ovary. See Placentation.

paripinnate

having an even number of leaflets (or pinnae), that is terminated by a pair of pinnae as opposed to a single pinna; compare imparipinnate.

patent

of plants, spreading.

pectinate

pinnately divided with narrow segments closely set like the teeth of a comb.

pedate

with a terminal lobe or leaflet, and on either side of it an axis curving outwards and backwards, bearing lobe or leaflets on the outer side of the curve.

pedicel

(adjective pedicellate) the stalk of a flower.

peduncle

(adjective pedunculate) the stalk of an inflorescence.

peltate

shield-like; with stalk attached to the lower surface and not to the margin.

pellucid

transmitting light; for example, said of tiny dots in leaves visible when held in front of light.

pendulous

hanging, for example an ovule attached to a placenta on the top of the ovary; compare suspended.

penicillate

tufted like an artist's brush; with long hairs towards one end.

penninervation (penninerved)

with pinnately arranged veins.

pepo

type of berry formed from an inferior ovary and containing many seeds, usually large with a tough outer skin, for instance, pumpkin, cucumber.

perennating

of an organ that survives vegetatively from season to season. A period of reduced activity between seasons is usual.

perennial

a plant whose life span extends over several years.

perfect

of a flower, when bisexual.

perfoliate

with its base wrapped around the stem (so that the stem appears to pass through it), e.g. of leaves and bracts.

perianth

the collective terms for the calyx and corolla of a flower (generally used when the two are similar).

pericarp

the wall of a fruit, developed from the ovary wall.

perigonium

1.  in flowering plants, the petals and sepals, the perianth

2.  in bryophytes, the leaves surrounding the antheridia, the perianth, also called a splash cup

perigynous

borne around the ovary, i.e. of perianth segments and stamens arising from a cup-like or tubular extension of receptacle (free from the ovary but extending above its base); cf. epigynous, hypogynous.

persistent

remaining attached to the plant beyond the usual time of falling, for instance sepals not falling after flowering, flower parts remaining through maturity of fruit; compare deciduous, caducous.

perule

1.  the scaly covering of a leaf or flower bud.

2.  in camellias the final bracts and sepals become indistinguishable and are called perules.

3.  a kind of sac formed by the adherent bases of the two lateral sepals in certain orchids.

petal

in a flower, one of the segments or divisions of the inner whorl of non-fertile parts surrounding the fertile organs, usually soft and conspicuously coloured; compare sepal.

petaloid

like a petal; soft in texture and coloured conspicuously.

petiolate

subtended by a petiole.

petiole

the stalk of a leaf.

petiolule

the stalk of a leaflet.

petricolous

Rock-dwelling; living on or among rocks.

phanerogam

gymnosperms and angiosperms; plants producing stamens and gynoecia; literally plants with conspicuous sexual reproductive organs; cf. cryptogams.

photosynthesis

the process by which sugars are made from carbon dioxide and water in cells containing chloroplasts; the chemical energy required from solar energy in the presence of the pigment chlorophyll.

phyllode

(adjective phyllodineous) a leaf with the blade much reduced or absent, and in which the petiole and or rachis perform the functions of the whole leaf; e.g. many acacias; cf. cladode.

phyllopodium

the part of the stipe that is proximal or basal of the articulation (joint) and remains attached to the rhizome after the frond has detached from the articulation; especially prominent in Elaphoglossum and Oleandra.

phytomelan

a black, inert, carbonaceous material that lacks nitrogen, probably derived from catechol, that forms a crust-like covering of some seeds, commonly found in Asparagales, Asteraceae, etc.

pilose

covered with soft, weak, thin and clearly separated hairs, which are usually defined as long and sometimes ascending.

pinna

(plural pinnae) a primary segment of a compound leaf.

pinnate

a compound leaf with leaflets arranged on each side of a common petiole or axis; also applied to how the lateral veins are arranged in relation to the main vein.

pinnatifid

pinnately lobed.

pinnatisect

pinnately divided almost to midrib but segments still confluent.

pinnule

ultimate free division (or leaflet) of a compound leaf, or a pinnate subdivision of a multipinnate leaf.

pistil

1.  a single carpel when the carpels are free.

2.  a group of carpels when the carpels are united by the fusion of their walls.

pith

the central region of a stem, inside the vascular cylinder; the spongy parenchymatous central tissue in some stems and roots.

placenta

the tissue within an ovary to which the ovules are attached.

placentation

the arrangement of ovules inside ovary; for example axile, free-central, parietal, marginal, basal, or apical.

Plant Breeders Rights (PBR)

these rights, governed by Plant Breeder's Rights Acts give the plant breeder legal protection over the propagation of a cultivar, and the exclusive rights to produce and to sell it, including the right to license others to produce and sell plants and reproductive material of a registered, deliberately bred variety. Cf. UPOV.

Plant Variety Rights (PVR)

governed by the Plant Variety Rights the registration of new varieties is now governed by Plant Breeders Rights.

Plastochron

the time between successive leaf initiation events.

plicate

pleated; folded back and forth longitudinally like a fan, such as the leaves of many palm species. (The concept often appears in specific names in forms such as Aloe plicatilis and Acacia plicata. Commonly such names are not correctly appropriate, but are applied to distichous structures rather than plicate.

-plinerved

(of leaves) a suffix indicating that the main nerves are lateral and arise from a point distinctly above the base of the leaf. Combined with a numerical prefix to form words like 3-plinerved, 5-plinerved, and so on. Such leaves are especially characteristic of the family Melastomataceae.

plumose

like a feather; with fine hairs branching from a main axis.

plumule

the part of an embryo that gives rise to the shoot system of a plant; cf. radicle.

pneumatophore

a vertical, aerial (at low tide) appendage to the roots of some plants, through which gases are exchanged; e.g. on mangroves.

pod

1.  a legume, the fruit of a leguminous plant, a dry fruit of a single carpel, splitting along two sutures.

2.  siliqua and silicula, the fruit of Brassicaceae, a dry fruit composed of two carpels separated by a partition.

pollen

powdery mass shed from anthers (of angiosperms) or microsporangia (of gymnosperms); the microspores of seed plants; pollen-grains.

pollen-mass

pollen-grains cohering by a waxy texture or fine threads into a single body; pollinium; e.g. in orchids.

pollination

the transfer of pollen from the male organ (anther) to the receptive region of a female organ (stigma).

pollinium

see pollen-mass.

polygamodioecious

having bisexual and male flowers on some plants and bisexual and female flowers on others; cf. androdioecious, andromonoecious, dioecious, monoecious, polygamomonoecious, polygamous.

polygamomonoecious

having male, female and bisexual flowers on the same plant; cf. androdioecious, andromonoecious, polygamodioecious, polygamous.

polygamous

having bisexual and unisexual flowers on the same plant.

polymorphic

of several different kinds (in respect to shape and/or size).

polyploid

with more than two of the basic sets of chromosomes in the nucleus; any individual (or a cell) containing three or more complete sets of chromosomes. Various combinations of words or numbers with '-ploid' indicate the number of haploid sets of chromosomes; e.g. triploid = 3 sets, tetraploid = 4 sets, pentaploid = 5 sets, hexaploid = 6 sets, and so on.

pome

a fruit that has developed partly from the ovary wall but mostly from the floral tube, e.g., apple.

population

1.  all individuals of one or more species within a prescribed area.

2.  a group of organisms of one species, occupying a defined area and usually isolated to some degree from other similar groups.

3.  in statistics, the whole group of items or individuals under investigation.

posterior

the side nearest the axis; compare anterior.

prickle

(adjective: prickly) hard, pointed outgrowth from the surface of a plant (involving several layers of cells but not containing a vein); sharp outgrowth from the bark, detachable without tearing wood; cf. thorn.

prophyll

a leaf formed at the base of a shoot, usually smaller than those formed later.

pro parte

(Latin) in part; in nomenclature, to denote that the preceding taxon includes more than one currently recognized entity, and that only one of those entities is being considered.

procumbent

spreading along the ground but not rooting at the nodes: not as close to ground as prostrate.

propagules

a structure capable of producing a new plant; includes seeds, spores, bulbils, etc.

prostrate

lying flat on the ground.

protandrous

male sex organs maturing before the female ones, e.g. a flower shedding pollen before the stigma is receptive; cf. protogynous.

prothallus

a gametophyte body, usually flattened and delicate; e.g. in ferns and fern allies.

protogynous

female sex organs maturing before the male ones, e.g. a flower shedding pollen after the stigma has ceased to be receptive; cf. protandrous.

proximal

near the point of origin or attachment; cf. distal.

pruinose

covered with a powdery, waxy material; with a bloom.

pseudanthium

a particular form of inflorescence occurring in many species of the Asteraceae, in which multiple flowers are grouped together to form a flower-like structure, commonly called a head or capitulum.

pseudo

false; apparently but not genuine; e.g. pseudo-bulb = a thickened, bulb-like internode in orchids, or a corm.

pseudostipule

an enlarged, persistent axillary bud scale that resembles a stipule; common in Bignoniaceae.

puberulous (puberulent)

covered with minute soft erect hairs.

pubescent

downy; covered with short, soft, erect hairs.

pulvinus

a swelling at the base of a leaf or leaflet stalk, often glandular or responsive to touch.

punctate

marked with dots.

pungent

having a sharp hard point.

pyramidal

of a plant's form, tetrahedral, pyramid-shaped.

pyrene

the stone of a drupe, consisting of the seed surrounded by the hardened endocarp.

pyriform

pear-shaped.

Q

quadrate

more or less square.

R

raceme

(adjective racemose) an indeterminate inflorescence in which the main axis produces a series of flowers on lateral stalks, the oldest at the base and the youngest at the top; cf. spike.

rachilla (rhachilla)

the axis of a grass spikelet, above the glumes.

rachis

(plural rachises; rachides) the axis of an inflorescence or a pinnate leaf; for example ferns; secondary rachis is the axis of a pinna in a bipinnate leaf distal to and including the lowermost pedicel attachment.

radial

with structures radiating from a central point as spokes on a wheel, for example, the lateral spines of a cactus.

radiate

of daisies, of a capitulum, with ray florets surrounding disc florets.

radical

springing from the root; clustered at base of stem.

radicle

the part of an embryo giving rise to the root system of a plant; cf. plumule.

rainforest

a forest dominated by broad-leaved trees with dense crowns that form a continuous layer (canopy) and with one or more of the following growth forms: epiphytes, lianas, treeferns, palms; eucalypts absent or are present only as isolated emergen, e.g. in Victoria, mesic vegetation is dominated by trees other than eucalypts, often with lianas and epiphytes.

ramet

an individual member of a clone.

ray

1.  zygomorphic (ligulate) flowers in a radiate flowerhead, that is, ray-florets/flowers, for example Asteraceae.

2.  each of the branches of an umbel.

receptacle

the axis of a flower, in other words, floral axis; torus; for example in Asteraceae, the floral base or common receptacle is the expanded summit of the peduncle on which the flowers are inserted.

recurved

bent or curved backwards or downwards.

reflexed

bent sharply back or down.

registered name

a cultivar name accepted by the relevant International Cultivar Registration Authority.

registered trade mark

a trade mark formally accepted by a statutory trade-mark authority and distinguished by the international ® sign.

registration

1.  the act of recording a new cultivar name with an International Cultivar Registration Authority.

2.  recording a new cultivar name with a statutory authority like the Plant Breeder’s Rights Office.

3.  recording a trade mark with a trade marks office. Compare registered trade mark.

regular

see actinomorphic.

reniform

kidney-shaped.

reticulate

forming a network (or reticulum), e.g. veins that join one another at more than one point.

retrorse

directed backwards or downwards; cf. antrorse.

retuse

with a blunt (obtuse) and slightly notched apex.

revision

an account of a particular plant group, like an abbreviated or simplified monograph. Sometimes confined to the plants of a particular region. Similar to a monograph in clearly distinguishing the taxa and providing a means for their identification; compare monograph.

revolute

rolled under (downwards or backwards), for example when the edges of leaves are rolled under towards the midrib; compare involute.

rhachis

see rachis.

rhizome

a perennial underground stem usually growing horizontally. See also stolon.

rhombic

like a rhombus: an oblique figure with four equal sides; compare trapeziform, trullate.

rhomboid

a four-sided figure with opposite sides parallel but with adjacent sides an unequal length (like an oblique rectangle); see also rhombic.

rhomboidal

a shape, for instance of a leaf, that is roughly diamond-shaped with length equal to width.

root

a unit of a plant's axial system which is usually underground, does not bear leaves, tends to grow downwards, and is typically derived from the radicle of the embryo.

root hairs

outgrowths of the outermost layer of cells just behind the root tips, functioning as water-absorbing organs.

rootstock

short, erect, swollen structure at junction of a plant's root and shoot systems, for example a corm. Also used to describe:

1. a part of a budded or grafted plant which supplies the roots, also called a rootstock, or plants grown specifically to produce these.

2.  plants or seeds with some specific attribute, for instance virus-free plants.

rosette

when parts are not whorled or opposite but appear so, due to the contractions of internodes, e.g. the petals in a double rose or a basal cluster of leaves (usually close to the ground) in some plants.

rostrate

with a beak.

rotate

circular and flattened; for example a corolla with a very short tube and spreading lobes (for instance some Solanaceae).

rudimentary

poorly developed and not functional; compare vestigial.

rugose

wrinkled.

rugulose

finely wrinkled.

ruminate

(usually applied to endosperm). irregularly grooved or ridged; appearing chewed. (a common type of endosperm in Myristicaceae).

runcinate

sharply pinnatifid or cleft, the segments directed downward.

runners

see stolon.

rupicolous

rupestral, saxicolous, growing on or among rocks. (compare epilithic, lithophytic)

rush

a plant belonging to the family Juncaceae or, more loosely, applied to various monocotyledons.

S

saccate

pouched.

sagittate

shaped like the head of an arrow; narrow and pointed but gradually enlarged at base into two straight lobes directed downwards; may refer only to the base of a leaf with such lobes; cf. hastate.

samara

a dry, indehiscent fruit with its wall expanded into a wing.

samphire

(in Australia) any plant of the tribe Salicorniae (chenopodiaceae), e.g. Sarcocornia, Halosarcia, Sclerostegia; or a community dominated by one or more of these species.

saprophyte

(adjective saprophytic) an organism deriving its nourishment from decaying organic matter and usually lacking chlorophyll; compare parasite, epiphyte.

scabrid (scabrous)

rough to the touch with short hard emergences or hairs.

scale

1.  a reduced or rudimentary leaf, for example around a dormant bud.

2.  a flattened epidermal outgrowth, such as those commonly found on the leaves and rhizomes of ferns.

scandent

climbing, by whatever means. See also: scandent in Wiktionary.

scape

(adjective scapose) a stem-like flowering stalk of a plant with radical leaves.

scapose

having the floral axis more or less erect with a few leaves or devoid of leaves; consisting of a scape.

scarious

dry and membranous.

schizocarp

a dry fruit formed from more than one carpel but breaking apart into individual carpels (mericarps) when ripe.

scion

the aerial part of a graft combination, induced by various means to unite with a compatible understock/roostock.

sclereid

a cell with a thick, often lignified, cell wall that is shorter than a fiber cell and dies soon after the thickening of its cell wall.

sclerenchyma

a strengthening or support tissue composed of sclereids or of a mixture of sclereids and fibers.

sclerophyll

(adjective sclerophyllous) a plant with hard, stiff leaves; leaves stiffened with thick-walled cells.

scorpioid

of a cymose inflorescence, when it branches alternately on one side and then the other; cf. helicoid.

scrubland

dense vegetation dominated by shrubs.

section (sectio)

the category of supplementary taxa intermediate in rank between subgenus and series. It is a singular noun always written with a capital initial letter, in combination with the generic name.

secund

with all the parts grouped on one side or turned to one side (applied especially to inflorescences).

sedge

a plant belonging to the family Cyperaceae.

seed

a ripened ovule, consisting of a protective coat enclosing an embryo and food reserves; a propagating organ formed in the sexual reproductive cycle of gymnosperms and angiosperms (together, the seed plants).

segment

part or subdivision of an organ, for example a petal is a segment of the corolla. A term sometimes used when the sepals and petals are indistinguishable.

self-pollination

also called selfing, the acceptance by stigmas of pollen from the same flower or from flowers on the same plant, which means they are self-compatible.

sensitive

a descriptive term for stigmas that, in response to touch, close the two lobes of the stigma together, ending the receptivity of the stigma, at least for the time that the lobes are closed together. Mimulus is perhaps the best-known example.

sensu

in the sense of.

sensu lato

of a plant name, in its broadest sense.

sensu stricto

of a plant name, in its narrowest sense.

sepal

in a flower, one of the segments or divisions of the outer whorl of non-fertile parts surrounding the fertile organs, usually green; compare petal.

septicidal

of a fruit, when it dehisces along the partitions between loculi; cf loculicidal.

septum

(plural septa) a partition, for example the membranous wall separating the two valves of the pod of Brassicaceae.

sericeous

silky with dense appressed hairs.

series

the category of supplementary taxa intermediate in rank between section and species. It is a plural adjective; for instance Primula subgenus Primula sect. Primula series Acaules.

serrate

toothed with asymmetrical teeth pointing forward; like the cutting edge of a saw.

serrulate

finely serrate.

sessile

without a stalk, e.g. of a stigma, when the style is absent.

seta

(adjectives setose, setaceous) a bristle or stiff hair (in Bryophytes, the stalk of the sporophyte); a terminal seta is an appendage to the tip of an organ, e.g. the primary rachis of a bipinnate leaf in Acacia.

sheath

a tubular or rolled part of an organ, e.g. the lower part of the leaf in most grasses.

shoot

usually the aerial part of a plant; a stem including its dependent parts, leaves flowers etc.

shrub

a woody perennial plant without a single main trunk, branching freely, and smaller than a tree.

sigmoid

shaped like the letter 'S'.

silicula

a stout siliqua (not more than twice as long as wide).

siliqua

a dry, dehiscent fruit (more than twice as long as wide) formed from a superior ovary of two carpels, with two parietal placentas and divided into two loculi by a 'false' septum.

silky

densely covered with fine soft straight appressed hairs, with a lustrous sheen and satiny to the touch.

silviculture

the science of forestry and the cultivation of woodlands for commercial purposes and wildlife conservation.

simple

undivided, for instance a leaf not divided into leaflets (note, however, that a simple leaf may be entire, toothed or lobed) or an unbranched hair or inflorescence.

sinuate

with deep, wave-like depressions along the margins, but more or less flat; compare undulate.

sinus

a notch or depression between two lobes or teeth in the margin of an organ.

solitary

single, of flowers that grow one plant per year, one in each axil, or widely separated on the plant; not grouped in an inflorescence.

spadix

a spicate inflorescence with a stout, often succulent axis.

spathe

a large bract ensheathing an inflorescence.

spathulate (spatulate)

spoon-shaped; broad at the tip with a narrowed projection extending to the base.

species

a group, or populations of individuals, sharing common features and/or ancestry, generally the smallest group that can be readily and consistently recognized; often, a group of individuals capable of interbreeding and producing fertile offspring. The basic unit of classification, the category of taxa of the lowest principal rank in the nomenclatural hierarchy.

specific epithet

follows the name of the genus, and is the second word of a botanical binomial. The generic name and specific epithet together constitute the name of a species; i.e. the specific epithet is not the species name.

spica

(adjective spicate) a spike.

spike

(adjective spicate) an unbranched, indeterminate inflorescence in which the flowers are without stalks; cf. raceme.

spikelet

a unit of the inflorescence especially in grasses, sedges and some other monocotyledons, consisting of one to many flowers and associated bracts (glumes).

spine

(adjective spinose) a stiff, sharp structure, formed by the modification of a plant organ that contains vascular tissue; e.g. a lateral branch or a stipule; includes thorns.

spinescent

ending in a spine; modified to form a spine.

spiral

of arrangement, when plant parts are arranged in a succession of curves like the thread of a screw, or coiled in a cylindrical or conical manner.

sporangium (sporangia)

a structure in which spores are formed.

spore

in non-flowering plants only a simple propagule, produced either sexually or asexually, and consisting of one or a few cells.

sporocarp

a fruiting body containing spores.

sporophyte

a plant, or phase of a life cycle, that bears the spores; cf. gametophyte.

sport

a naturally occurring variant of a species, not usually present in a population or group of plants; a plant that has spontaneously mutated so that it differs from its parent plant.

spreading

extending horizontally, for example branches; standing out at right angles to axis, for example leaves or hairs.

spur

1.  a short shoot.

2.  a conical or tubular outgrowth from the base of a perianth segment, often containing nectar.

stalk

the supporting structure of an organ, usually narrower in diameter than the organ.

stamen

(adjective staminate) male organ of a flower, consisting (usually) of a stalk (filament) and a pollen-bearing portion (anther).

staminode

a sterile stamen, often rudimentary, sometimes petal-like.

standard

the large posterior petal of pea-flowers.

standard specimen

a representative specimen of a cultivar (or other taxon), one that demonstrates how the name of that taxon should be used.

stellate

star-shaped, for example a type of hair.

stem

the plant axis, either aerial or subterranean, which bears nodes, leaves, branches and flowers.

stem-clasping

see amplexicaul.

sterile

infertile, for example a stamen that does not bear pollen, or a flower that does not bear seed.

stigma

the pollen-receptive surface of a carpel or group of fused carpels, usually sticky; usually a point or small head at the summit of the style.

stipe

in ferns, the stalk of a frond; generally a small stalk.

stipella

(stipel; plural stipellae) one of two small secondary stipules at the base of leaflets in some species.

stipitate

stalked; borne on a stipe; of an ovary, borne on a gynophore.

stipulate

bearing stipules.

stipule

small appendage at the bases of leaves in many dicotyledons.

stolon

slender, prostrate or trailing stem, producing roots and sometimes erect shoots at its nodes. See also rhizome.

stoloniferous

having stolons.

stoma

(plural stomata) a pore; small hole in the surface of a leaf (or other aerial organ) allowing the exchange of gases between tissues and the atmosphere.

striate

striped with parallel, longitudinal lines or ridges.

strigose

covered with appressed, rigid, bristle-like, straight hairs; the appressed equivalent of hispid.

strobilus

(plural strobili) a cone-like structure consisting of sporophylls borne close together on an axis, for instance in some club-mosses, and other conifers.

style

an elongated part of a carpel, or group of fused carpels, between the ovary and the stigma.

stylodium

an elongate stigma that resembles a style, a false style, e.g. commonly found in Poaceae and Asteraceae.

stylulus

the elongated apex of a free carpel which functions like the style of a syncarpous ovary, allowing pollen tubes from its stigma to enter the locule of only that carpel.

subgenus

the category of supplementary taxa intermediate between genus and section. It is a singular noun, always has a capital initial letter and is used in combination with the generic name; e.g. Primula subgenus Primula.

subshrub

undershrub; small shrub which may have partially herbaceous stems, but generally a woody plant less than 1 m high.

subspecies

a grouping within a species, usually used for geographically isolated and morphologically distinct entities. Its taxonomic rank occurs between species and variety.

subtend

to stand beneath or close to, as in a bract at the base of a flower.

subquadrangular

not quite square; see also quadrangular in wiktionary.

subulate

narrow and tapering gradually to a fine point.

succulent

juicy, fleshy; a plant with a fleshy habit.

sucker

a shoot of more or less subterranean origin; an erect shoot originating from a bud on a root or a rhizome, sometimes at some distance from the stem of the plant.

sulcate

furrowed; grooved.

superficial

on the surface.

superior

of an ovary, borne above the level of attachment of the other floral parts, or above the base of a floral tube (that is, one that is free from the ovary and bears the perianth and stamens); compare inferior, half-inferior.

suspended

of an ovule, when attached slightly below the summit of the ovary; compare pendulous.

suture

a junction or seam of union. (see fissure, commissure)

sward

extensive, more or less even cover of a surface, for example a lawn grass; compare tussock.

sympatric

with more or less similar or overlapping ranges of distribution.

syconium

a hollow infructescence containing multiple fruit, such as that of a fig.

syn- (sym-)

with, together.

sympetalous

with united (connate or fused) petals.

synangium

a fused aggregate of sporangia.

syncarpous

of a gynoecium, made up of united carpels.

synonym

outdated name or 'alternative' name for the same taxon.

T

taproot

the main, descending root of a plant with a single dominant root axis.

taxon

(plural taxa) a group or category in a system of classification, derived from the Greek prefixes taxo-, taxis- meaning arrangement.

taxonomy

the study of the principles and practice of classification.

tegmen

the inner layer of the testa (seed coat). It develops from the inner integument of the ovule.

tendril

a slender organ (modified e.g. from stem, leaf, leaflet or stipule) used by climbing plants to cling to an object.

tepal

perianth segment, either sepal or petal; usually used when all perianth segments are similar in appearance; cf. petal.

terete

circular in cross-section; more or less cylindrical.

terminal

situated at the tip or apex.

ternate

in groups of three; of leaves, arranged in whorls of three; of a single leaf, with the leaflets arranged in groups of three. See Leaf shape.

terrestrial

generally denotes of or on the ground; of habitat, on land as opposed to in water (aquatic) or on rocks (lithophytic), or other plants (epiphytic), and so on.

testa

seed coat.

tetrad

a group of four; usually means four pollen grains remaining fused together a maturity, e.g. in the Epacridaceae.[3]

tetraspore

the asexual spore of red algae. It is so named because each sporangium produces just four spores. See Rhodophyceae.[4]

thorn

a sharp, stiff point, usually a modified stem, that cannot be detached without tearing the subtending tissue; a spine; cf. prickle.

throat

the opening of a corolla or perianth.

thyrse

a branched inflorescence in which the main axis is indeterminate (racemose) and the lateral branches determinate (cymose).

tomentum

(adjective tomentose) a dense covering of short, matted hairs. Tomentose is often used as a general term for bearing an indumentum, but this is not a recommended use.

toothed

with a more or less regularly incised margin.

torus

see receptacle.

trademark (trade mark)

a distinctive word, picture, symbol, smell or other device or any combination or multiples of these. It must not be descriptive of the goods or services, nor can it be geographical nor a surname. Used to distinguish one trader from another, compared with PBR which protect the commercial name of a particular plant variety.

trapeziform

1.  like a trapezium (a four-sided figure with two parallel sides of unequal length)

2.  like a trapezoid (a four-sided figure, or quadrilateral, with neither pair of sides equal); sometimes used erroneously as a synonym for rhombic.

tree

a woody plant, usually with a single distinct trunk and generally more than 5 m tall.

triad

a group of three.

triangular

planar and with 3 sides.

tribe

a taxonomic grouping, in rank between genus and species.

trichome

in non-filamentous plants, any hair-like outgrowth from epidermis, e.g. a hair or bristle; sometimes restricted to unbranched epidermal outgrowths.

trifoliolate (or trifoliate)

a compound leaf of three leaflets, for example a clover leaf.

trigonous

triangular in cross-section and obtusely angled; cf. triquetus.

trinerved

having three nerves or veins.

triplinerved

(of leaves) having three main nerves with the lateral nerves arising from the midnerve above the base of the leaf.

triquetrous

more or less triangular in cross-section, but acutely angled (with 3 distinct longitudinal ridges); cf. trigonus.

trivial name

the second word in the two-part scientific name of an organism; cf. specific epithet.

trophophyll

a vegetative, nutrient-producing leaf or microphyll, whose primary function is photosynthesis. It is not specialized or modified for some other function. (compare: sporophyll).

trullate

ovate but angled; like a bricklayer's trowel; inverse kite-shaped; compare rhombic.

truncate

cut off squarely; with an abruptly transverse end.

trunk

the upright large main stem of a tree.

truss

a compact cluster of flowers or fruits arising from one centre; for instance, evident in many rhododendrons.

tuber

an underground storage organ formed by the swelling of an underground stem which produces buds and stores food, forming a seasonal perennating organ, for example potato; compare tuberoid.

tubercle

a small wart-like outgrowth.

tuberculate

covered in tubercles; warty.

tuberoid

an underground storage organ formed by the swelling of a root; occurs in many orchids.

tuberous

resembling a tuber; producing tubers.

tubular

with the form of a tube or cylinder.

tunic

outer covering of some bulbs and corms.

turbinate

top-shaped.

turgid

swollen with liquid; firm; compare flaccid.

tussock

a dense tuft of vegetation, usually well separated from neighbouring tussocks, for example some grasses; compare sward.

two-ranked

having leaves arranged in two rows in the same plane, on opposite sides of the branch; = distichous.

type

an item (usually a herbarium specimen) to which the name of a taxon is permanently attached, i.e. a designated representative of a plant name. Important in determining the priority of names available for a particular taxon.

type genus

in nomenclature, the genus from which the family is based.

typography

the presentation of printed matter, covering issues such as type styles (e.g. italic or roman type), underlining, emboldening and letter spacing.

U

umbel

(adjective umbellate) a racemose inflorescence in which all the individual flower stalks arise in a cluster at the top of the peduncle and are of about equal length; in a simple umbel, each stalk is unbranched and bears only one flower; a cymose umbel is an apparent umbel but its flowers open centrifugally.

umbonate

with a conical or blunt projection arising from a flatter surface, as on the top of a mushroom, or in the scale of a pine cone.

uncinate

with a hook at the apex.

undershrub

a low shrub, often with flowering branches that die off in winter; cf. subshrub.

undulate

wavy and not flat; compare sinuate.

unilocular

having one loculus or chamber, e.g., the ovary in the families Proteaceae and Fabaceae.

uniserial

Arranged in a single row or series. Unbranched. Uniseriate.

uniseriate

Arranged in a single row or series. Unbranched. Uniserial.

unisexual

of one sex; bearing only male or only female reproductive organs.

unitegmic

(of an ovule), covered by a single integument.

urceolate

urn-shaped.

utricle

a small bladder; a membranous bladder-like sac enclosing an ovary or fruit; in sedges a fruit in which the pericarp is larger than, and loosely encloses, the seed.

V

valvate

of sepals and petals in bud, which meet edge to edge but do not overlap.

valve

a portion of an organ that fragments or splits open, for example the teeth-like portions of a pericarp in a split (dehisced) capsule.

var

see varietas.

variant

a plant or group of plants showing some measure of difference from the characteristics associated with a particular taxon.

varietas (variety in common usage, abbreviated as var.)

(Latin) in the Linnean hierarchy a rank below that of species, between the ranks of subspecies and form.

variegated

irregularly marked with blotches or patches of another colour.

Vasculum

Container used by botanists for collecting field specimines.

vein

a strand of vascular tissue; nerve.

veinlet

a small vein; the ultimate (visible) division of a vein.

velvety

densely covered with fine, short, soft, erect hairs.

venation

the arrangement of veins in a leaf.

ventral

the front; in particular, towards the axis in a lateral organ or towards substratum in prostrate plant; compare dorsal.

vernation

the arrangement of unexpanded leaves in a bud; the order of unfolding of leaves from a bud.

verrucose

with warts.

versatile

of anthers, swinging freely about the point of attachment to the filament.

verticillate

arranged in one or more whorls.

vescicular

of hairs, bladder-like; vesciculous, bearing such hairs.

vessel

a capillary tube formed from a series of open-ended cells in the water-conducting tissue of a plant.

vestigial

reduced in form and function from the normal or ancestral condition.

villous

Abounding in or covered with long, soft, straight hairs; shaggy with soft hairs.

vine

1.  Vitis.

2.  Scandent plants climbing by means of trailing or twining stem or runner.

3.  Such a stem or runner[2][5]

viscid

sticky; coated with a thick, syrupy secretion.

viviparous

1.  seeds or fruits which germinate before being shed from the parent plant.

2.  the development of plantlets on non-floral organs e.g. leaves.

W

warty

a surface covered with small round protuberances, especially in fruit, leaves, twigs and bark, see tuberculate.

watershoot

an erect strong-growing or epicormic shoot developing from near the base of a shrub or tree, but distinct from a sucker.

weed

loosely defined as a plant growing where it is not wanted; commonly associated with disrupted habitats

1. agricultural weed: a plant which taints produce or pollutes crops.

2.  environmental weed: naturalised, exotic or ecologically 'out-of-balance' indigenous species outside the agricultural or garden context which, as a result of invasion, adversely affects the survival or regeneration of indigenous species in natural or partly natural vegetation communities (Carr, G.W., in Foreman & Walsh, 1993).

wild

originating from a known wild habitat (wilderness). See Wildlife.

whorl

a ring of organs borne at the same level on an axis, for example leaves, bracts or floral parts.

wing

1.  a membranous expansion of a fruit or seed which aids in dispersal, for instance on pine seeds.

2.  a thin flange of tissue extending beyond the normal outline of a structure, e.g. on the column of some orchids, on stems, on petioles.

3.  one of the two lateral petals of a flower of subfamily Faboideae of family Fabaceae, located between the adaxial standard (banner) petal and the two abaxial keel petals.

woolly

very densely covered with long, more or less matted or intertwined hairs, resembling sheep's wool.

X

xeromorph

a plant with structural features (e.g. hard or succulent leaves) or functional adaptations that prevent water loss by evaporation; usually associated with arid habitats, but not necessarily drought-tolerant; cf. xerophyte.

xerophyte

a plant generally living in a dry habitat, typically showing xeromorphic or succulent adaptation; a plant able to tolerate long periods of drought; cf. xeromorph.

Z

zygomorphic

bilaterally symmetrical; symmetrical about one vertical plane only; applies to flowers in which the perianth segments within each whorl vary in size and shape; compare actinomorphic, irregular.

zygote

a fertilized cell.

See also

  • International scientific vocabulary
  • leaf shape
  • Glossary of plant morphology
  • list of plant morphology terms
  • plant morphology

References

  1. ^ Shreve, Forrest; Wiggins, Ira. Vegetation and Flora of the Sonoran Desert. Stanford University Press, 1964. ISBN 978-0804701631
  2. ^ a b Jackson, Benjamin, Daydon; A Glossary of Botanic Terms with their Derivation and Accent; Published by Gerald Duckworth & Co. London, 4th ed 1928
  3. ^  Beach, Chandler B., ed. (1914). "Tetrad". The New Student's Reference Work. Chicago: F. E. Compton and Co.
  4. ^  Beach, Chandler B., ed. (1914). "Tetraspore". The New Student's Reference Work. Chicago: F. E. Compton and Co.
  5. ^ Brown, Lesley (1993). The New shorter Oxford English dictionary on historical principles. Oxford [Eng.]: Clarendon. ISBN 0-19-861271-0.

Bibliography

  • Stearn, W.T. 1983. Botanical Latin. David & Charles, North Pomfret, Vermont.
  • Benjamin D. Jackson. A Glossary of Botanic Terms. Duckworth: London. J.B. Lippincott Company: Philadelphia (1928).
  • Michael Hickey and Clive King. 2001. The Cambridge Illustrated Glossary of Botanical Terms. Cambridge University Press: U.K.. ISBN 978-0-521-79401-5
  • James G. Harris and Melinda Woolf Harris. Plant Identification Terminology: An Illustrated Glossary. Spring Lake Publishing: Spring Lake, UT, USA. (1994).
  • David B. Lellinger. 2002. A Modern Multilingual Glossary for Taxonomic Pteridology (Pteridologia, 3). American Fern Society. ISBN 978-0-933500-02-0.
  • Ernest M. Gifford and Adriance S. Foster. 1989. Morphology and Evolution of Vascular Plants, 3rd edition. W. H. Freeman. ISBN 978-0-7167-1946-5

The links immediatly below are are to Waynes World an online text book of natural history.  
Here you will find information ablout all leaf shapes etc


Leaf Terminology Part 1


Leaf Terrninology Part 2


Flower Terminology  Part 1


Flower Terminology  Part 2 


Flower Terminology  Part 3 


Inflorescence Terminology Part 1


Inflorescence Terminology Part 2