106 LEGUMINOSJE. (PULSE FAMILY.) 



leaves beneath soft-downy and hoary ; leaflets oval; racemes mauy-flcweied ; pod 

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



26. AOTPIIICARPJEA, Ell. HOG PEA-NUT. 



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

 seldom ripening fruit ; 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 scymctar-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, stipellatc. Flowers small, 

 hi clustered or compound racemes, purplish. Bracts persistent, round, partly 

 clasping, striatc, as well as the stipules. (Name from a/x^>t, at both ends, and 

 <ap7ros, fruit, in allusion to the two kinds of fruit, one at the summit, the other 

 at the base of the plant.) 



1. A. inoiiolca, Nutt. Racemes nodding; bracts each supporting 2 or 

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

 lands. Aug., Sept. A delicate vine. 



27. CL-ITORIA, L. BUTTERFLY PEA. 



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

 iunded, notched at the top, not spurred on the back : keel small, shorter than 

 the wings. Stamens monadclphous below. Pod linear-oblong, flattisli, knotty, 

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

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

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

 vation obscure.) 



1. C. Mtiruma, L. Smooth; leaflets oblong-ovate or ovate-lanceolate ; 

 stipules and bracts awl-shaped; peduncles short; 1 -3-flowcrcd. Dry banks, 

 Long Island to Virginia and southward. r uly. Low, ascending or twining ; 

 the showy pale-blue flowers 2' long. 



28. CENTROS^UIA, DC. SPURRED BUTTERFLY PEA. 



Calyx short, 5-cleft. Corolla, &c. much as in Criteria, 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- 

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

 lets striate, the lat*r longer than the calyx. (Name from Ktvrpov, a spur, and 

 i the standard.) 



1. C. Virgiiimiiiini, Benth. Rather rough with minute hairs ; leaflet* 





