Asepalous. Without sepals. 



Asexual. Characterized by reproduction which does not involve the fusion of a 

 sperm and an egg. 



Attenuate. Gradually narrowed to a point at apex or base. 



Atypical. Not typical; departing from the norm. 



Auricle. An earlike appendage (fig. 25). 



Auriculate. Eared (fig. 787). 



Autumnal. Belonging to autumn; flowering at, or developing vegetative growth pe- 

 culiar to, that season. 



Awl-shaped. Tapering gradually from the base to a slender tip, as does a needle. 



Awn. A stiff, bristle-like appendage, usually at the end of an organ, (fig. 112). 



Awned. Provided with an awn (fig. 741). 



Axil. The upper angle between an organ and the axis which bears it, such as the 

 angle between the leaf and the stem bearing the leaf. 



Axile placentation. Placentation in fruits the seeds of which are borne attached to 

 the placenta situated in the angles of the cross walls along the axis (fig. 789). 



Axillary. Growing in an axil. 



Axis. The main or central line of development of a plant, structure, or organ, 

 such as the main stem. 



Baccate. Berrylike and pulpy. 



Balanced hair. A hair seemingly attached at the middle (fig. 786). 



Banner. The upper, broad, more or less erect petal of a papilionaceous flower; 

 standard (fig. 501). 



Barbed. Furnished with reflexed projections (figs. 170, 364). 



Barbellate. Finely barbed (fig. 741). 



Barbulate. Having fine beards. 



Basal placentation. The attachment of the ovule at the base of the ovary. 



Base. Basal or lower part of a plant or organ; through growth this basal part may 

 eventually become uppermost. 



Basifixed. Attached by the base. 



Bayou. A creek, often slow-moving. 



Beak. A long, substantial point, which may be terete or angular (fig. 741). 



Beaked. Ending in a beak (fig. 741 ) . 



Bearded. Furnished with long, stiff hairs or bristles. 



Berry. A fleshy fruit, few- to many-seeded. 



Bi- or Bis-. Latin prefix signifying two, twice or doubly. 



Bibracteate. Having two bracts. Bibracteolate: the diminutive. 



Bidentate. Two-toothed (fig. 272). 



Biennial. A plant requiring two years in which to complete its life history; the 

 first year the vegetative growth occurs, and the second year it flowers, seeds 

 and dies. 



Bifid. Split into two parts; two-cleft. 



Bifoliolate. A leaf composed of two leaflets. 



Bifurcate. Forked; said of Y-shaped hairs, for example. 



Bilabiate. Divided into two separate parts or lips (fig. 656). 



Binomial. The combination of a generic and specific name to denote a given or- 

 ganism, as Ulmus americana. 



Bipartite. Divided into two parts almost to the base; two-parted. 



Bipinnate. Said of leaves wherein both the primary and the secondary divisions 

 are pinnate. 



Bisexual. Having both sexes on the same individual; a hermaphrodite. 



Bisulcate. Having two grooves or furrows. 



1707 



