LEGUMINOSAE (PULSE FAMILY) 529 



1.2-4 cm. long ; corolla greenish-white and purplish ; pod terete, 5-7.5 cm. wide, 

 4-8-seeded. nearly glabrous ; seeds oblong, about 6 mm. long., usually very pu- 

 bescent. {S. angulosa Ell.) — Sandy shores and river-banks, coast of ]Mass. and 

 south w,; along the Great Lakes to Minn., and s. to Kan. and Tex. June-Sept. 



Var. missouriensis (Wats.) Britton. Climbing high (3-10 m.) ; leaflets often 

 8 cm. long, rhombic-ovate, rarely at all lobed ; seeds 6-8 mm. long. — River bot- 

 toms, D. C.-. 111.. Mo., and Kan. Flowering somewhat later. 



2. S. umbellata (Muhl.) Britton. Stems wore slender, 6-12 dm. long, from 

 a perennial rootstock ; leaflets ovate to oblong-linear, rarely at all lobed, 2.5 

 cm. long or less ; pod r3.5-5 cm. long, scarcely 4 mm. wide; seeds much smaller, 

 short-oblong to quadrate. (S. peduncnlans Ell.) — Damp sandy ground, L. I. 

 to Fla. and Tex.; north w. in Mi.ss. basin to s. Ind. Sept., Oct. 



0. S. paucifl5ra (Benth.) Wats. Annual, slender, low-climbing, pubescent: 

 leaflets oblong-lanceolate or ovate-oblong to linear, not lobed, 2.5 cm. long ; pod 

 pubescent, 2-;iJ cm. long, flattish ; seeds as in the last, very finely mealy, soon 

 glabrate. — River-banks, Ind. to Minn., Kan.. Tex., and Miss. July, Aug. 



48. CLIT6RIA L. Butterfly Pea 



Standard much larger than the rest of the flower, erect, rounded, notched at 

 the top, not spurred on the back ; keel small, shorter than the N^ings, incurved, 

 acute. Stamens monadelphous below. Pod linear-oblong, flattish, knotty, sev- 

 eral-seeded, pointed with the base of the style. — Erect or twining perennials, 

 with mostly pinnate 3-foliolate stipellate leaves, and very large flowers. Pedun- 

 cles 1-o-flowered ; bractlets opposite, striate. (Derivation recondite.") 



1. C. mariana L. Low, ascending or twining, smooth ; leaflets oblong-ovate 

 or ovate-lanceolate ; stipules and bracts awl-shaped ; peduncles short ; the showy 

 pale blue flowers 5 cm. long. — Dry banks, N. J. to Fla. and Tex., northw. in 

 Miss, basin to III. and Mo. June-Aug. 



'©• 



49. CENTROSEMA (DC.) Benth. 



Corolla, etc., much as in Clitoria, but the spreading standard with a spur- 

 shaped projection on the back near the base ; keel broad. Pod long and linear, 

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

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

 perennials, with 3-foliolate stipeUa,te leaves, and large showy flowers. (Name 

 from KevTpov, a spjir, and crrj/xa. a standard.) Bradburta Raf. 



1. C. virginianum (L.) 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, 2.5 cm. long; 

 pods straight, 1-1.2 dm. long. — Sandy woods, " N. J." and Md. to Fla., Ark., 

 and Tex. July, Aug. 



50. d6lichos l. 



Calyx bell-shaped, with deltoid teeth, the upper pair united nearly or quite 

 to the apex. Standard orbicular, with incurved auricles at base. Flowers fas- 

 ciculate-racemose. Pods linear and falcate, or oblong-lunate, compressed ; seeds 

 several. (The Greek doXix^s, long, a word also employed by Theophrastus as 

 the name of some kind of pulse.) 



1. D. LXblab L. (Hyacinth Bean.) Stoutish twining annual, 3-6 m. in 

 length ; leaflets large, deltoid-ovate ; flowers purple ; pods 2 cm. broad. — Often 

 cultivated for ornament and in tropical countries for its seeds ; tending to escape, 

 D. C. to O, (Introd. from India.) 



51. AMPHICARPA Ell. Hog Peanut 



Flowers of 2 (or 3) kinds ; those of the racemes from the upper branches 

 perfect ; those near the ba.se and on filiform creeping brandies with the corolla 



gray's manual — 34 



