Genus 48. 



PEA FAMILY. 



423 



I. Phaseolus polystachyus (L.) B.S.P. Wild Bean or Bean Vine. Fig. 2646. 



Dolichos polystachyus L. Spi PI. 726. 1753. 

 Phaseolus perennis Walt. Fl. Car. 182. 1788. 

 Phaseolus polystachyus B.S.P. Prel. Cat. N. Y. 15. i888. 



Climbing over bushes, or trailing, from a perennial 

 root, finely pubescent, branched, 4°-iS° long. Stipules 

 lanceolate, deciduous ; leaflets broadly ovate or nearly 

 orbicular, acute or acuminate at the apex, rounded at 

 the base, 2-4' long, the terminal one often slightly 

 cordate, the lower ones unequal-sided; racemes axillary, 

 usually numerous, peduncled, 4'-i2' long, narrow, 

 loosely-flowered ; pedicels 2"-4" long, minutely bracted 

 at the base; corolla purple, about 4" long; pods stalked, 

 drooping, somewhat curved, flat, iV-2i' long, 4"-S" 

 wide, 4-6-seeded, glabrous or nearly so; seeds chocolate- 

 brown, 3"-4" long. 



In thickets, Canada (Torrey and Gray) ; Connecticut to 

 Florida, Ohio, Nebraska and Texas. Recorded from Minne- 

 sota. July-Sept. Called also wild kidney bean. 



49. STROPHOSTYLES Ell. Bot. S. C. & Ga. 2 : 229. 1822. 



Twining or trailing herbaceous vines, rarely erect, mostly pubescent, with pinnately 

 3-foIiolate 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 (pandi). Style longitudinally bearded, 

 bent. Pod linear, nearly terete, or somewhat compressed, 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. Type species : Strophostyles angulosa Ell. 



Leaflets mainly lobed, I'-z' long ; pod 2'-^' long ; root annual. 

 Leaflets mainly entire, >i'-ij^' long; pod I'-a' long. 



Flowers several, about 6" long ; root perennial. 



Flowers few, about 3" long ; root annual. 



1. S. helvola. 



2. S. umbellata. 

 3 5'. pauciflora. 



I. Strophostyles helvola (L.) Britton. Trailing Wild Bean. Fig. 2647. 



Phaseolus heli'Olus L. Sp. PI. 724. 1753. 

 Phaseolus angulosus Ort. Nov. PI. 24. 1797. 

 Phaseolus diversifolius Pers. Syn. 2: 296. 1807. 

 Strophostyles angulosa Ell. Bot. S. C. 2 : 229. 182: 

 5. helvola Britton ; Britt. & Brown, 111. Fl. 2 ; 338. 



1897. 



its seeds slightly larger. 



Prostrate or low-twining, rather rough-pubescent, branched 

 at the base, 2°-8° long, rarely erect and io'-2o' high. Root 

 annual; stipules narrowly lanceolate, i"-2" long; leaflets 

 broadly ovate, obtuse or acute at the apex, rounded at the 

 base, thickish, generally more or less obtusely lobed, some- 

 times entire, l'-2' long, the lower ones often inequilateral; 

 peduncles axillary, exceeding the petioles ; flowers 3-10, ses- 

 sile, capitate ; corolla greenish-purple, 4"-6" long; keel slender, 

 curved; 'pod sessile, linear, nearly terete, slightly pubescent, 

 2'-3' long ; seeds oblong, pubescent, 2j"-3i" long. 



In sandy soil, Quebec to Massachusetts, Florida, Ontario, South 

 Dakota, Kansas and Texas. July-Oct. 



Strophostyles missouriensis (S. Wats.) Small, regarded as a 

 variety of this species in our first edition, differs by being a longer 

 vine, climbing over trees and bushes, its leaflets nearly entire and 

 It ranges from Virginia to Illinois and Kansas. 



