AACUMINATE tapering to a point.
ACUTE sharply pointed but not drawn out.
ADPRESSED lying flat for the length of the organ.
ADVENTITIOUS applied to roots, those which do not arise from the radicle but from another part of the plant, usually the stem.
AESTIVATION the manner in which the parts of the flower are folded before expanding.
ANNUAL a plant which completes its life cycle within a year.
ANNULUS in some Stapelieae, the portion of the corolla which forms a fleshy, raised ring.
ANTHER the part of the stamen which contains the pollen.
APICULATE tipped with an apiculus, a short, sharp point.
ASPERULOUS slightly rough with little points.
AWN a stiff hairy bristle.
AXIL the angle between the axis (stem or branch) and the part arising from it (leaf or bract).
AXILE belonging to the axis, as in axile placentation.
AXILLARY growing in an axil.
BBIENNIAL a plant that completes its full life-cycle in two years.
BIFID divided into two parts.
BILABIATE having two lips.
BISEXUAL having stamens and pistil in the same flower.
BRACT a modified leaf associated with the flowering part of the plant.
BRACTEATE possessing bracts.
BRACTEOLE a small bract.