

LEGUMINOSAE (PULSE FAMILY) 529 



1.2-4 cm. long ; corolla greenish-white and purplish ; pod terete, 6-7.5 cm. wide, 

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

 bescent. (S. tuii/itlusa Ell.) Sandy shores and river-banks, coast of Mass, and 

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

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

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

 toms, 1). C., 111., Mo., and Kan. Flowering somewhat later. 



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

 a perennial rootstock ; leaflets ovate to oblong-linear, rarely at all lobed, 2.6 

 cm. long or less ; pod 3.6-5 cm. long, scarcely 4 mm. wide ; seeds much smaller, 

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

 to Fla. and Tex.; northw. in Miss, basin to s. Ind. Sept., Oct. 



3. S. pauciflbra (Benth.) Wats. Annual, slender, low-climbing, pubescent; 

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

 pubescent, 2-3 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 wings, incurved, 

 acute. Stamens monadelphous below. Pod linear-oblong, fiattish, 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 1-3-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 111. 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 with a raised line on each side next the margin. Twining 

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

 from Ktvrpov, a spur, and o-ij/xa, a standard.} BRADBURYA 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 SoXix<5s, 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 base and on filiform creeping branches with the corolla 



GRAY'S MANUAL 34 



