LEGUMINOS.E. (PL'LSE FAMILY.) 141 



• ♦ Pi>ds stmifjlit and Um-nr, fltit : jtrdnwli-s short, 1 -fiw-Jlowerrd at the summit: 

 jjijictrs sinnll : kvd hss iiinticid. 

 •1. P. pauciflorus, Ikntli. Anmial ; stems (liffiisc, but twining, slender, 

 puhL'Sccnt ; IcatlL'ts vai yiiijj IVoni ol)loiiy:-ianccoliitc or ovatc-oblong to linear, 

 (r. leiospermus, Torr. ^- dr.) — River-banks, Illinois {Mead) and soutbwcst- 

 ward. July - Scjjt. — Flowers 3" lony, purjjlc. Tod 1' long, pubescent. 



26. CENTROSEMA, DC. SruitRKo BuTTEurLY-PEA. 



Calyx short, 5-el«ft. Corolla, &c. much as in Clitoria, but the spreading 

 standard with a spur-shaped projection on the back near the base : keel broad. 

 Style bearded at the apex around the terminal stigma. Pod long and linear, 

 flat, pointed with the awl- shaped style, many-seeded, thickened at the edges, 

 tJie valves marked with a raised line on each side next the margin. — Twining 

 perennials, with 3-foliolatc stipellate leaves, and large showy flowers. Stipules, 

 bracts, and bractlets striate, the latter longer than the calyx. (Name from 

 KtvTpov, a s/mr, and at)fia, the standard.) 



1. C. Virgini^num, Bcnth. Rather roi'gh with minute hairs; leaflets 

 varying from oblong-ovate to lanceolate and linear, very veiny, shining ; pedun- 

 cles 1 - 4-flowered ; calyx-teeth lincar-awl-shaped. — Sandy woods, from Mary- 

 land southward. Jidy. — Corolla 1' long, violet. I'ods straight, 4-5' long. 



27. CLITORIA, L. Bltterfly-Pea. 



Calyx tubular, rj-toothed. Standard nnuii larger than the rest of the flower; 

 erect, rounded, notched at the top, not spurred on the Itack : keel small, shorter 

 than the wings, incurved, acute. Stamens monadelphous below. Style bearded 

 down the inner face. Pod linear-oblong, flatfish, knotty, several-seeded, pointed 

 with the base of the style. — Erect or twining perennials, with mostly pinnately 

 3-(oliolatc stipellate leaves, and very large flowers. Peduncles 1-3-flowered: 

 braetleti opposite, striate. (Derivation recondite.) 



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

 stipules aiidi)racts awl-shapcd ; peduncles short, 1-3-flowcred. — Dry banks, 

 E. New Vork to Virginia and southward. July. — Low, ascending or twining ; 

 the showy pale-blue flowers i>' long. 



28. AMPHICARPJEA, Ell. Hog Pea-nct. 



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 with the 

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

 Cfjually 4- (rarely 5-) toothed : bractlets none or minute. Keel and wing-petals 

 similar, almost straight ; the standard i>artly folded round them. Stamens dia- 

 delphous. Style beardless. Pods of the upper flowers, when formed, somewhat 

 scymetar-shaped, 3-4-seedcd; of the lower ones commonly subterranean, oI)0- 

 vate or ])ear-sbaped, fleshy, ri])ening usually but one large seed. — Low and 

 slender perennials; the twining stems clothed with brownish hairs. Leaves 

 pinnately 3-foliokite ; leaflets rhombic-ovate, stipellate. Flowers small, in clus- 



