Awl-shaped. Narrowed upward from the base to a slender or rigid point.

Awn. A bristle-shaped appendage.

Axil. The angle formed by a leaf or branch with the stem.

Axile. Situated in the axis.

Axillary. Situated in an axil.

Axis. The central line of any organ or support of a group of organs; a stem, etc.

Baccate. Berry like; pulpy throughout.

Barbed. Furnished with rigid points or short bristles, usually reflexed like the barb of a fish-hook.

Barbellate. Finely barbed.

Barbulate. Finely bearded.