Genus 48. 



PEA FAMILY. 



423 



I. Phaseolus polystachjms (L.) B.S.P. Wild Bean or Bean \"ine. Fig. 2646. 



Dolichos polystachyus L. Spi PL 7-:6. i75J- 



Phaseolus fcrennis Walt. Fl. Car. 182. 178S, 



Phaseolus polystachyus B.S.P. Prel. Cat. K. Y, 15. iSSS. 



Climbing over bushes, or trailing, from a perennial 

 root, finely pubescent, branched, 4-i5 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, \-2V 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-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 (gandi). Stjde 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 : Stroj^liostyles aitgulosa EII. 



Leaflets mainly lobed, i'-^' long; pod 2'-^' long: root annual. 

 Leaflets mainly entire. yi'-i'A' long; pod I'-j' long. 



Flowers several, about 6" long ; root perennial. 



Flowers few, about 3" long ; root annual. 



1. S. helvola. 



2. S.timbellata. 

 3 S. pauciflora. 



I. Strophostyles helvola (L.J Brittoti. Trailing Wild Bean. Fig. 2647. 



Phaseolus helvolus L. Sp. PI. -24. 1753. 

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

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

 Strophostyles angulosa Ell. Bot. S. C. 2 : 229. 1822. 

 5'. helvola Britton ; Britt. & Brown, 111. Fl. 2 ; 338. 1897. 



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, I'-a' 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, 2i"-3i" long. 



In sandy soil, Quebec to Massachusetts, Florida. Otitario. 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 

 its seeds slightly larger. It ranges from Virginia to Illinois and Kansas. 



