Awl-shaped. Shaped like the point of an awl; narrow and tapering to a point.
Awn. A bristle-like terminal or dorsal appendage, especially common on the glumes of grasses.
Awned. Having awns.
Axil, Axilla. The angle contained between the axis and any organ arising from it, as a leaf.
Axile. Belonging to the axis or situated in it, as axile placentation.
Axillary. Growing in an axil.
Axis. The central line of a body in the direction of its length; the stem.
Baccate. Berried; having the form or nature of a berry.
Barb. Hooked hairs.
Barbate. Bearded; provided with long weak hairs arranged in tufts.
Barbed. Furnished with barbs or hooked hairs.
Barbellate. Provided with short stiff hairs.
Bark. The outer covering or integument of the wood exterior to the cambium layer.
Basal. At the base of any organ or part.
Basifixed. Attached by the base or lower end.
Basilar. Basal.
Beak. A prolonged tip.
Beaked. Ending in a beak; often applied to fruits which end in a long point.
Berry. A succulent or pulpy fruit containing many seeds.
Bi- or Bis-. A Latin prefix signifying two or twice—as bibracteate, having two bracts; bidentate, with two teeth.
Biennial. A plant which lives only two years.
Bifarious. Arranged in two opposite rows or ranks; distichous.
Bifid. Two-cleft; divided halfway into two.
Bilabiate. Divided into lips, as is the case with many gamopetalous corollas.
Bilocular. Two-celled.
Binate. Applied to leaves composed of two leaflets at the end of a common petiole, or to a single leaf almost divided into two.
Bipartite. Divided nearly to the base into two parts.
Bipinnate. Twice pinnate; when both the primary and secondary divisions of a leaf are pinnate.
Biserrate. Doubly serrate, as when the serratures themselves are serrate.
Biternate. Twice ternate.
Blade. The expanded portion of a leaf.
Bract. A modified leaf subtending a flower or a cluster of flowers; modified leaves placed in the space between the calyx and the true leaves.
Bracteate. Furnished with bracts.
Bracteole. A secondary bract upon the pedicel of a flower; a small bract.
Bracteolate. Furnished with bracteoles.
Branch. A division of the stem or main axis.
Branchlet. a small branch; the ultimate division of a branch.
Bristle. A stiff hair.
Bristle-pointed. Ending in a stiff, bristle-like hair.
Bud. The early stage of a flower or branch.
Bulb. A rounded subterranean body formed of fleshy scales or coatings; in reality a modified bud which ultimately develops leaves and flowers.
Bulbous. Having bulbs, or possessing the structure of a bulb.
Bullate. Blistered or puckered, as the leaf of Myrtus bullata.
Caducous. Falling away early; not at all persistent.
Cæspitose. Growing in tufts somewhat in the same way as grass.
Calcarate. Provided with a spur.
Callosity. A thickened and hardened swelling on the surface of any organ.
