654 FABACEAE 



blades rhomboidal-oval to 3-lobed, 2-4 cm. long, acute or acutish : peduncles twice or 

 thrice as long as the leaves : pedicels stout, about 1 mm. long : calyx glabrate, 3-3.5 mm. 

 long ; lobes abruptly pointed, about as long as the tube : corolla purple or purplish, fading 



greenish ; standard with a blade fully 1 cm. wide : pods linear, nearly terete, 6-10 cm. 

 >ng. [Phaseolus helvolus L. ] 



In sandy soil, Quebec to Minnesota, Massachusetts, Florida and Texas. Summer and fall. 



4. Strophostyles Missomiensis (S. Wats.) Small. Annual, sparingly pubescent. 

 Stems climbing, 3-9 m. long, branching, retrorsely pubescent : leaflets 3, the blades 

 ovate, 3-8 cm. long, often somewhat rhomboidal, lustrous above, abruptly acuminate or 

 apiculate, short-stalked : peduncles becoming longer than the subtending leaves : calyx 

 sparingly pubescent, the lower and middle lobes lanceolate, as long as the tube or longer : 

 corolla pink or bluish ; standard with a thin blade 1-1.5 cm. wide : pods linear, 7-9 mm. 

 long, somewhat flattened. [S. angulosa var. Missouriensis S. Wats.] 



In alluvial soil, Missouri and Arkansas. Fall. 



52. VIGNA Savi. 



Vines, with prostrate or twining stems. Leaves alternate : blades pinnately 3-folio- 

 late : stipules usually sessile at the base of the petiole : leaflets with entire or sometimes 

 lobed blades. Flowers perfect, few in cluster-like racemes terminating axillary peduncles. 

 Calyx slightly 2-lipped : lobes all unequal, relatively short. Corolla yellowish or pur- 

 plish, sometimes variegated : standard with a suborbicular blade auricled at the base : 

 wings curved : keel about as long as the wings, incurved with or without a spirally twisted 

 beak. Stamens diadelphous (9 and 1). Anthers alike. Style filiform, thickened or 

 dilated. Stigma oblique or lateral. Ovules numerous. Pod narrow, nearly terete, straight 

 or curved. CHINA BEAN. Cow PEA. 



Standard less than 2 cm. long : pods pubescent. 1. V. repens. 



Standard over 2 cm. long : pods glabrous. 2. V. Sinensis. 



1. Vigna repens (L.) Kuntze. Foliage usually pubescent with rather appressed 

 hairs. Stems trailing or climbing, branching, when pubescent the hairs reflexed : leaflets 

 3, the blades ovate to lanceolate or linear, 2-8 cm. long, acute, more or less distinctly re- 

 ticulated, short-stalked : petioles usually longer than the leaflets : peduncles surpassing the 

 subtending leaves, retrorsely pubescent at the top : pedicels 1-3 mm. long, corymbose : 

 calyx campanulate, oblique ; lobes triangular to lanceolate : corolla yellow ; standard with 

 a nearly reniform, notched blade, less than 2 cm. long : pods linear, 4-5 mm. long, nearly 

 terete, pubescent. [V. luteola (Jacq. ) Benth.] 



In marshes and thickets along the coast, Georgia to Florida and Texas. Also in tropical America. 



2. Vigna Sinensis (L. ) Endl. Foliage glabrous or sparingly pubescent. Stems 

 trailing or climbing, 0.3-2 m. long, branching : leaflets 3, the blades ovate or ovate-hastate, 

 8-15 cm. long, acutish to acuminate, the lateral ones very inequilateral : peduncles usually 

 shorter than the leaves, minutely pubescent near the ends : pedicels stout, 1-2 mm. long : 

 calyx campanulate, 7-8 mm. long ; lobes acuminate, somewhat shorter than the tube : 

 corolla yellowish tinged with purple ; standard over 2 cm. long : pods fleshy, 10-18 cm. 

 long, slightly curved, glabrous. 



In thickets and waste places, North Carolina to Missouri, Florida and Texas. Cultivated and ad- 

 ventive or naturalized. Summer and fall. 



53. CANAVALIA DC. 



Perennial herbs, with prostrate or twining stems. Leaves alternate, with small stipules : 

 blades pinnately 3-foliolate : leaflets with entire, often ample, thickish blades. Flowers 

 perfect, in axillary peduncled racemes. Calyx 2-lipped, the upper lip truncate or 2-lobed, 

 the lower one entire or 3-lobed. Corolla of various colors : standard reflexed ; blade sub- 

 orbicular, large : wings curved or twisted : keel-petals incurved, broader than the wings, 

 obtuse or with an inflexed or spiral beak. Stamens diadelphous ( 9 and 1 ) or monadel- 

 phous to the middle. Style glabrous, incurved, or involute with the keel. Ovules several. 

 Pod flat or slightly swollen, oblong or broadly linear, 2-valved. Seeds white, red or brown. 



Leaflets rounded or retuse at the apex : pods 10-12 cm. long : corolla mainly pink. 1. C. obtusifolia. 

 Leaflets abruptly pointed : pods 20-30 cm. long : corolla mainly white. 2. C. gladiata. 



1. Canavalia obtusifolia (Lam.) DC. Foliage finely strigillose. Stems prostrate 

 or climbing, 1-5 m. long, branching : leaflets 3, the blades leathery, suborbicular to oval 



