LKP.UMINOSJE. (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 <rrpo(f>Tj, a turn- 

 ing, and <T-TV\OS, a style.) ' 



1. S. angulosa, Kll. 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-/obed), 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. Missouriensis, 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, I' long or 

 less; pod 14 -2' long and scarcely 2" wide; seeds much smaller, 1^-2" long, 

 short-oblong to quadrate. (Phaseolus helvolus, J/aw., etc. ; not L.) Sandy 

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



3. S. pauciflorus, 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 panciflorus, Bent/i.) 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 edgi-s, 

 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 

 Kfvrpov, a spur, and tr^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 



10 



