PAPILIONACEAE. 57 1 



the segments narrowly lanceolate, acuminate; corolla little longer than the calyx; 

 pod oblong, acute, very pubescent, about 2.5 cm. long. In dry soil, Mo. to La. 

 and Tex. May-June. 



3. Dolicholus erectus (Walt.) Vail. Erect Dolicholus. (I. F. f. 2232.) 

 Erect, velvety-pubescent or tomentose, 3-8 dm. high. Stipules linear-lanceolate, 

 acuminate ; petioles shorter than or equalling the leaves ; leaflets oval, ovate or 

 slightly obovate, thick, densely tomentose, especially beneath, 2.5-5 cm - i° n g"> 

 racemes 5-15. flowered, sessile or short-peduncled; flowers 6-10 mm. long; pod 

 oblong, 12-17 mm. long. In dry soil, Del. to Fla., Tenn. and La. May-Sept. 



4. Dolicholus simplicifolius (Walt.) Vail. Round-leaved Dolicholus. 

 (I. F. f. 2233.) Simple, pubescent. Stipules lanceolate, acuminate ; petioles 

 shorter than or exceeding the leaves; leaflet orbicular or broader, thick, obtuse, 

 slightly cordate at the base, 2.5-3 cm - l° n g (leaflets rarely 3, the lateral ones 

 ovate); racemes rather densely flowered, peduncled; flowers 6-10 mm. long; pod 

 as in the preceding. In dry soil, Va. to Fla., west to La. May-July. 



44. PHASEOLUS L- 



Vines, rarely erect herbs, with pinnately 3-foliolate leaves, and axillary race- 

 mose flowers. Calyx 5-toothed or 5-lobed, or the 2 upper teeth more or less united. 

 Standard orbicular, recurved, spreading or somewhat contorted; wings mainly 

 obovate; keel spirally coiled, linear or obovoid. Stamens diadelphous (9 and 1). 

 Style longitudinally bearded; stigma oblique or lateral; ovary sessile or nearly so; 

 ovules 00 . Pod linear, 2-valved, several-seeded, tipped with the persistent style. 

 Seeds mostly with rounded ends. Rachis thickened at the bases of the pedicels. 

 [Ancient name of the Kidney Bean.] About 170 species, of warm and temperate 

 regions. Besides the following, about 12 others occur in the Southern States. 



I. Phaseolus polystachyus (L.) B.S.P. Wild Bean or Bean Vine. 

 (I. F. f. 2234.) Perennial, finely pubescent, 1.2-4 m. l° n g- Stipules lanceolate, 

 deciduous ; leaflets broadly ovate or nearly orbicular, acute or acuminate, rounded 

 at the base, 5-10 cm. long, the terminal one often slightly cordate; racemes 

 peduncled, 1-3 dm. long, narrow, loosely flowered; pedicels minutely bracted at the 

 base; corolla purple, about 8 mm. long; pods stalked, drooping, somewhat curved, 

 flat, 4-6 cm. long, 4-6-seeded, glabrous or nearly so; seeds chocolate- brown, 

 6-8 mm. long. In thickets, Canada (Torrey and Gray); Conn, to Fla., Minn., 

 Neb. and La. July-Sept. 



45. STROPHOSTYLES Ell. 



Herbaceous vines, rarely erect, with pinnately 3-foliolate stipellate leaves, and 

 pink-purple or nearly white flowers capitate at the ends of long axillary peduncles. 

 Calyx as in Phaseolus. Standard nearly orbicular; wings mostly obovate; keel 

 strongly curved. Stamens diadelphous (9 and 1). Style longitudinally bearded, 

 bent. Pod linear, usually straight, few-several-seeded, tipped by the persistent 

 style. Seeds truncate at the ends, more or less pubescent or mealy. [Greek, bent 

 style. ] An American genus, of about 6 species. 



Leaflets mainly lobed, 2-5 cm. long; pod 5-8 cm. long. 1. S. helvola. 



Leaflets mainly entire, 1-4 cm. long ; pod 2-5 cm. long. 



Flowers several, about 12 mm. long; root perennial. 2. S. umbellata. 



Flowers few, about 6 mm. long ; root annual. 3. S. pauciflora. 



1. Strophostyles helvola (L.) Britton. Trailing Wild Bean. (I. F. f. 

 2235.) Prostrate or low-twining, rather rough-pubescent, 6-16 dm. long, rarely 

 erect, and 2.5-5 dm. high- Stipules narrowfy lanceolate, 2-4 mm. long; leaflets 

 broadly ovate, rounded at the base, thickish; peduncles axillary, exceeding the 

 petioles; flowers 3-10. sessile; corolla greenish purple, 9-12 mm. long; keel 

 slender, curved; pod slightly pubescent; seeds oblong, pubescent. In sandy soil, 

 Quebec to Fla.. S. Dak., Neb. and Tex. July-Oct. 



Strophostyles hd-lvola Missouriensis (S. Wats.) Britton. Climbing in trees to a 

 height of 6-10 m. Leaflets larger, usually entire; seeds larger. Said to bloom later. 

 Mo. and Kans. 



2. Strophostyles umbellata (Muhl.) Britton. Pink Wild Bean. (I. F. f. 

 2236.) Stems trailing, more or less pubescent with retrorse hairs, 3-15 dm. long. 



