528 LEGUMINOSAE (PULSE FAMILY) 



lanceolate to linear, acute; peduncles 4-9-flowered ; the yellow flowers 1.5-2 

 cm. long. —Fields and waste places, local, N. B. to N. Y. and Out. June-Aug. 

 (Nat. from Eu.) 



44. ApIOS [Boerh.] Ludwig. Groundnut. Wild Bean 



Calyx somewhat 2-lipped, the 2 lateral teeth being nearly obsolete, the upper 

 very siiort, the lower one longest. Standard very broad, reliexed ; the long 

 scythe-shaped keel strongly incurved, at length coiled. Stamens diadelphous. 

 Pod straight or slightly curved, linear, elongated, thickish, many-seeded. — 

 Perennials, twining and climbing over bushes; the rootstocks with tuberous 

 enlargements. Leaflets 3-9, ovate-lanceolate, obscurely stipellate. Flowers 

 in dense and short often branching racemes. (Name from dTrtoj^, a pair, from 

 the shape of the tubers.) 



1. A. tuber5sa Moench. Bootstocks moniliform^ the tuberous enlargements 

 numerous ; flowers hrown-purple, violet-scented; standard unappendaged at the 

 summit. (^A. Apios MacM.) — Thickets, N. B. to Fla., Minn., Kan., and La. 

 July-Sept. 



2. A. Priceana Robinson. Tuber solitary, very large; flowers pale rose- 

 color; standard bearing a fleshy knob at the apex. — Woods and thickets, 

 Warren Co., Ky. (^Miss S. F. Price). July-Sept. 



45. PHASEOLUS [Tourn.] L. Kidney Bean 



Calyx .5-toothed or 5-cleft, the two upper teeth often shallower. Stamens 

 diadelphous. Stigma oblique or lateral. Pod scythe-shaped, several-many- 

 seeded, tipped with the hardened base of the style. Cotyledons thick and 

 fleshy, rising out of the ground nearly unchanged in germination. — Twining 

 herbs, with pinnately 3-foliolate stipellate leaves. Flowers racemose, produced 

 in summer and autumn. (The ancient name of the Kidney Bean.) 



1. P. polystachyus (L.) BSP. (Wild Bean.) Perennial; leaflets round- 

 ish-ovate, short-pointed ; flowers purple, handsome, but small ; pods drooping, 

 4-5-seeded. (P. perennis Walt.) — Copses, chiefly near the coast, Ct. to Fla. 

 and La.; northw. in Miss, basin to Mo., 111., and Lid.; reported northw. to 

 Minn, and Neb. July-Sept. 



46. ViGNA Savi 



Habit and floral characters nearly as in Phaseolus, but the keel merely arcu- 

 ate not spirally coiled at the tip. — Twining herbs, with pinnately 3-foliolate 

 leaves. (Dedicated to Dominico Vigna, Italian scientist of the 17th century.) 



1. V. SINENSIS (L.) Endl. (Cow Pea.) Annual ; leaflets broadly ovate, 

 often very oblique or sometimes slightly contracted above an obtusely hastate 

 base ; flowers few, loosely subcapitate at the end of the long stii!ish peduncle ; 

 pods 1-2 dm. long. (F. Catjang Walp.) — Cultivated, and tending to escape, 

 Mo. {Bush), s. to the Gulf. (Introd. from Asia.) 



47. 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. Otherwise as Phaseolus. — Stems prostrate or climbing, more or 

 less retrorsely hairy. Stipules and bracts striate. (Name from <TTpo<p'r], a turn- 

 ing, and (ttOXos, a style.) 



1. S. helvola (L.) Britton. Annual; stems branched, 0.3-2 m. long; leaf- 

 lets 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, 



