106 LEGUMINOS^. (pulse FAMILY.) 



leaves beneath soft-downy and hoary ; leaflets oral ; racemes many-flowered ; pods 

 very downy. — S. Pennsylvania, Maryland, and southward. July. 



26. AMPHICARP.«:A, Ell. Hoo Pea-nut. 



Flowers of 2 kinds, those of the racemes from the upper branches perfect, but 

 seldom ripening frait ; those near the base and on creeping branches imperfect, 

 with the corolla none or rudimentary, and few free stamens, but fruitful. Calyx 

 about equally 4- (rarely 5-) toothed, with no bractlets. Keel and wing-petals 

 similar, nearly straight ; the standard partly folded round them. Stamens dia- 

 delphous. Pods of the upper flowers, when formed, somewhat scymetar-shaped, 

 3 - 4:-seeded ; of the lower, obovate or pear-shaped, fleshy, ripening usually but 

 one large seed, commonly subterranean, or concealed by decaying leaves. — 

 Low and slender perennials; the twining stems clothed with brownish hairs. 

 Leaves pinnately 3-foliolate : leaflets rhombic-ovate, stipellate. Flowers small, 

 in clustered or compound racemes, pui-plish. Bracts persistent, round, partly 

 clasping, striate, as well as the stipules. (Name from afi^l-, at both ends, and 

 KapTvos, fruit, in allusion to the two kinds of fruit, one at the summit, the other 

 at the base of the plant.) 



1. A. monoica, Nutt. Eacemes nodding; bracts each supporting 2 or 

 more flowers, shorter than the pedicels ; subteixanean pods hairy. — Rich wood- 

 lands. Aug., Sept. — A delicate vine. 



27. CLITOBIA, L. Butterfly Pea. 



Calyx tubular, 5-toothcd. Standard much larger than the rest of the flower, 

 rounded, notched at the top, not spuiTod on the back : keel small, sliorter than 

 the wings. Stamens monadelplious below. Pod linear-oblong, flattish, knotty, 

 several-seeded, pointed with the base of the style, the valves nerveless. — Erect 

 or twining perennials, with mostly pinnately 3-foliolate stipellate leaves, and 

 very large flowers. Peduncles 1 -3-flowered: bractlets opposite, striate. (Deri- 

 vation obscure.) 



1. C. M£ll'iaiia, L. Smooth; leaflets oblong-ovate or ovate-lanceolate ; 

 stipules and bracts awl-shajjed; peduncles short; 1- 3-flowered. — Diy banks. 

 Long Island to Virginia and southward. July. — Low, ascending or twining ; 

 the showy pale-blue flowers 2' long. 



28. CENTBOSEMA, DC. Spurred Butterfly Pea. 



Calyx short, 5-cleft. Corolla, &e. much as in Clitoria, but the standard with 

 a spur-shaped projection on the back. Pod long and linear, flat, pointed with 

 the awl-shaped style, many-seeded, thickened at the edges, the valves marked 

 with a raised line on each side next the margin. — Twining perennials, with 3- 

 foliolate stipellate leaves and large showy flowers. Stipules, bracts, and bract- 

 lets striate, the latloi- longer than the calyx. (Name from Kevrpov, a spur, and 

 o-fiiia, the standard. ) 



1. C Tirginia.na, Benth. Rather rough with minute hairs; leaflets 



