LEGUMINOS^E. (PULSE FAMILY.) 145 



34. STROPHOSTYLES, Ell. 



Keel of the corolla with the included stamens and style elongated, strongly 

 incurved, not spirally coiled. Pod linear, terete or flattish, straight or nearly 

 so. Seeds quadrate or oblong with truncate ends, mealy-pubescent or glabrate ; 

 hilum linear. Flowers few, sessile and capitate-clustered on the mostly long 

 peduncles. Otherwise as Phaseolus. Stems prostrate or climbing, more or 

 less retrorsely hairy. Stipules and bracts striate. ' (Name from cn-poty^, a turn- 

 ing, and (TTV\OS, a style.) 



1. S. angulbsa, Ell. Annual; stems branched, 1 -6 long; leaflets ovate 

 to oblong-ovate (rarely linear-oblong), with a more or less prominent rounded 

 lobe toward the base (the terminal 2-lobed), or some or all often entire, about 1' 

 (6 - 20") long ; corolla greenish-white and purplish ; pod terete, 2 - 3' long by 

 3" wide, 4 - 8-seeded, nearly glabrous ; seeds oblong, about 3" long, usually very 

 pubescent. (Phaseolus diversifolius, Pers. P. helvolus, L.) Sandy shores 

 and river-banks; coast of Mass, and southward, along the Great Lakes to 

 Minn., and south to Kan. and Tex. 



Var. MiS8OUri6nsis, Watson in herb. Climbing high (10-30); leaves 

 often 3' long, rhombic-ovate, rarely at all lobed ; seeds 3 - 4" long. River- 

 bottoms near Independence, Mo. ; nearly two months later. (F. Bush.) 



2. S. peduncularis, Ell. Stems more slender, from a perennial root- 

 stock, 2-4 long; leaflets ovate to oblong-linear, rarely at all lobed, V long or 

 less; pod l -2' long and scarcely 2" wide ; seeds much smaller, lJ-2" long, 

 short-oblong to quadrate. (Phaseolus helvolus, Man., etc., not L.) Sandy 

 ground, Long Island and N. J. to Fla., west to S. Ind., Ky., and La. 



3. S. paucifl6rus, Watson in herb. Annual, slender, low-climbing, pu- 

 bescent ; leaflets oblong-lanceolate or ovate-oblong to linear, not lobed, 1' long; 

 pod pubescent, 1' long, flattish; seeds as in the last, very finely mealy, soon 

 glabrate. (Phaseolus pauciflorus, Benth.) River-banks, Ind. to Minn., south 

 to Miss, and Tex. 



35. CENTROSEMA, DC. SPURRED BUTTERFLY-PEA. 



Calyx short, 5-cleft. Corolla, etc., 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, 

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

 ttfvrpov, a spur, and <Hj/ua, a standard.) 



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

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

 cles 1 -4-flowered; calyx-teeth linear-awl-shaped; corolla violet, 1' long; pods 

 straight, 4 - 5' long. Sandy woods, Md. to Fla. and Ark. (Trop. Am.) 



36. CLITORIA, L. BUTTERFLY-PEA. 



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

 erect, rounded, notched at the top, not spurred on the back ; keel small, shorter 



