E

echinate: bearing stiff, stout, prickly hairs.

edaphic: pertaining to the soil.

eglandular: without glands.

elaiosome: an appendage of a seed, usually rich in oil, attractive to fauna (especially ants) and hence an aid to dispersal by such fauna.

elater: in Equisetum, an appendage to the spore.

elliptic: oval in outline, widest at the centre.

emarginate: having a broad, shallow notch at the apex.

embryo: a young plant contained within an archegonium or seed.

embryo-sac: a large, multi-nucleate cell in which an egg nucleus is formed and fertilised, and in which an embryo begins to develop.

emersed: of leaves, flowers, etc., rising above the surface of water in which the plant is rooted.

enation: an epidermal outgrowth.

endemic: having a natural distribution confined to a particular geographical region.

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, in angiosperms triploid and formed in the embryo sac after fertilisation, in gymnosperms haploid and derived from the sterile portion of the female gametophyte. cf. perisperm.

ensiform: sword-shaped.

entire: having a smooth margin, not dissected or toothed.

entomophilous: pollinated by insects.

ephemeral: short-lived.

epicalyx: a whorl of bracts, just below a flower, looking like a second calyx.

epicarp: the outer layer of the wall of a fruit, i.e. the 'skin'. Also known as the exocarp.

epicormic: of buds, shoots or flowers, borne on the old wood of trees (applied especially to shoots arising from dormant buds after injury or fire).

epicortical: on top of the bark, i.e. outside the bark.

epidermis: the outermost layer of cells of an organ, usually only one cell thick.

epigeal: of germination, having the cotyledon(s) emerging from the seed coat and becoming photosynthetic. cf. hypogeal.

epigynous: of floral parts (especially stamens), attached above the level of insertion of the ovary, and arising from tissue that is fused to the ovary wall. cf. hypogynous, perigynous.

epipetalous: borne on the petals.

epiphyllous: growing on leaves, e.g. the vegetatively derived plantlets of some Crassulaceae; of bryophytes, lichens, fungi, growing upon leaves but not parasitic on them.

epiphyte: a plant growing on, but not parasitic on, another plant (often loosely applied to plants, such as orchids, that grow on vertical rock faces). cf. autotrophic, parasite, saprophyte.

episepalous: of stamens, borne on the sepals.

equilateral: of stamens, with anthers regularly spaced around the style.

equitant: of a leaf, folded in half along the midline so that the adaxial surface disappears from view, and overlapping the edges of a similarly folded leaf on the opposite side of the stem (at least at the base).

eremean: belonging to regions of low, irregular rainfall.

erose: of a margin, finely and irregularly eroded or incised.

eucamptodromous: of leaves, pinnate venation in which the secondary veins do not terminate at the margins but which gradually diminish inside the margin, connected to the superadjacent secondary veins by a series of cross-veins without forming prominent marginal loops. cf. acrodromous, brochidodromous, semicraspedodromous.

eusporangiate: of ferns, having sporangia with walls more than one cell thick. cf. leptosporangiate.

evergreen: bearing green leaves throughout the year. cf. deciduous.

excentric: to one side; off centre.

exine: the outer layer of the wall of a pollen grain or spore.

exocarp (= epicarp): the outer layer or "skin" of the wall of a fruit.

exserted: protruding, e.g. of stamens with respect to a corolla tube.

exstipulate: without stipules.

extrafloral: of nectaries, not within the flower.

extrastaminal: outside the stamens.

extravaginal: of a shoot, arising from an axillary bud which breaks through the sheath of the subtending leaf.

extrorse: of anthers, opening away from the centre of the flower. cf. introrse.

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F

facultative: of parasites, optional. cf. obligate.

falcate: sickle-shaped.

family: a group of one to many genera believed to be related phylogenetically, usually clearly separable from other such groups; the major taxonomic group between genus and order.

farinaceous: containing starch grains; mealy; resembling flour.

fascicle: a cluster, adj. fasciculate.

favulariate: of a surface, finely ribbed, the ribs separated by zig-zag furrows.

fenestrate: having openings or translucent areas ('windows').

fertilisation: the union of male and female gametes.

filament: the stalk of a stamen; a thread one or more cells thick. cf. anther.

filiform: thread-like.

fimbriate: of a margin, fringed with long slender hair-like processes (called fimbriae).

fimbrillate: minutely fimbriate.

fistular: hollow throughout its length.

flabellate (= flabelliform): fan-shaped.

flaccid: limp; tending to wilt. cf. turgid.

flagelliform: long and very slender, like a whip-lash.

flexuose (= flexuous): bent from side to side in a zig-zag form.

floccose: bearing tufts of soft hairs or wool which tend to rub off and adhere in small masses.

floral: belonging to or associated with a flower.

floret: a grass flower, together with the lemma and palea that enclose it (often also applied to the individual small flowers in Cyperaceae and Asteraceae).

flower: the sexual reproductive structure of the angiosperms, typically consisting of gynoecium, androecium and perianth and the axis bearing these parts.

foliaceous: leaf-like.

follicle: a dry, dehiscent fruit formed from one carpel and dehiscing along the line of fusion of its edges.

forb: a non-woody plant other than a grass, sedge, rush, etc. cf. herb.

-form: superficially resembling; e.g. umbelliform (inflorescence resembling but not truly an umbel).

foveate: pitted.

free-central: of placentation, with the ovules borne on a free-standing central placenta within the ovary.

free: of floral organs, not fused or united with other similar organs.

frond: a leaf, especially of a fern, cycad or palm.

fruit: the seed-bearing structure in angiosperms, formed from the ovary after flowering.

frutescent: becoming shrub-like (woody).

fruticose: shrub-like.

fugacious: falling or withering away very early.

fulvous: dull yellowish brown or yellowish grey.

funicle (= funiculus): the stalk of an ovule.

fusiform: spindle-shaped, i.e. narrower at both ends than at the centre.

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Last updated on 13 May 1999.

Australian Biological Resources Study