B

baccate: berry-like; of seeds, having a succulent or pulpy testa; of fruits, having the seeds embedded in pulp.

barbed trichome: a trichome with terminal or lateral retrorse projections, each projection being a barb.

barbellae: short, straight, stiff hairs or barbs.

barbulae: in Scaevola (Goodeniaceae), outgrowths on the margin of the wings or in the throat of the corolla, sometimes with apical hairs or papillae.

basal: at the base; of a placenta, at the base of the ovary.

basifixed: attached at or by the base, e.g. of anthers, by the base of the connective. cf. medifixed, versatile.

basipetal: developing, in sequence, from the apex towards the base. cf. acropetal.

basiscopic: facing towards the base. cf. acroscopic.

basitonic: of flowering seasonal growth units (seasonal shoots), producing no leaves (but sometimes some bracts) below the inflorescence, cf. acrotonic.

beak: a prominent terminal projection, especially of a carpel or fruit.

berry: a fleshy or pulpy indehiscent fruit with the seed(s) embedded in the fleshy tissue of the pericarp. cf. drupe, pyrene.

biennial: a plant whose life span extends for more than one but less than two years after germination. cf. annual, perennial.

bifacial: of leaves, flat or channelled with distinct adaxial and abaxial surfaces. cf. unifacial.

bifid: divided, for about half the length, into two parts. cf. bipartite.

bifoliate: of plants, having two leaves.

bifoliolate: of leaves, having two leaflets.

bigeminate: in two pairs; of pinnate leaves, having only two pairs of pinnae.

bilabiate: two-lipped, e.g. of a corolla in which fusion of an anterior group and a posterior group of petals extends beyond the top of the corolla tube.

bilamellate: consisting of two plates or lamellae.

bilocular: having two cavities.

bipartite: divided, nearly to the base, into two parts. cf. bifid.

bipinnate: of leaves, twice pinnately divided. cf. pinnate, tripinnate.

biseriate: arranged in two rows or whorls.

bisexual (= hermaphrodite): bearing both male and female organs together, e.g. on the same gametophyte or in the same flower.

biternate: twice ternate, the three pinnae each divided into three pinnules.

blade: the expanded part of a leaf or petal. cf. lamina, limb.

bole: the trunk of a tree, below the lowest branch. cf. canopy.

brachyblast: a short branch; a spur shoot.

bract: a leaf-like structure, different in form from the foliage leaves and without an axillary bud, associated with an inflorescence or flower.

bracteole: a small bract-like structure borne singly or in pairs on the pedicel or calyx of a flower.

bristle: a rigid trichome similar to a pig's bristle.

brochidodromous: of leaves, pinnate venation in which the secondary veins do not terminate at the margins but are joined in a series of prominent arches. cf. acrodromous, eucamptodromous, semicraspedodromous.

bulb: a storage organ, usually underground, made up of a stem and leaf bases, the food reserves being stored in the inner, fleshy leaf bases.

bulbel (= bulblet): a bulb arising from another bulb.

bulbil: a small, deciduous bulb (or tuber) formed in the axil of a leaf or replacing flowers in an inflorescence, and functioning to propagate the plant vegetatively.

bullate: having a blistered or puckered surface; of a leaf surface, prominently raised (like a bubble) between veins.

burr: a rough or prickly propagule consisting of a seed or fruit and associated floral parts or bracts.

buttress: a vertical flange of tissue protruding from the base of the main trunk of a tree.

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Last updated on 13 May 1999.

Australian Biological Resources Study