PAPIUONACEAE. 



[VOL. II. 



44. PHASEOLUS L. Sp. PI. 723. 1753. 



Annual or perennial vines, rarely erect herbs, with pinnately 3-foliolate leaves, and 

 axillary racemose 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 obo- 

 vate, equalling or exceeding the standard; keel spirally coiled, linear or obovoid. Stamens 

 diadelphous (9 and i); anthers all alike. Style longitudinally bearded; stigma oblique or 

 lateral; ovary sessile or nearly so; ovules oo. Pod linear, straight or curved, 2-valved, sev- 

 eral-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, natives of warm and temperate regions. Besides the following, about 12 

 others occur in the southern and southwestern states. 



i. Phaseolus polystachyus (L,.) B.S.P. 

 Wild Bean or Bean Vine. (Fig. 2234.) 



Dolichos polystachyus L,. Sp. PI. 726. 1753. 

 Phaseolus ferennisVfa.lt. Fl. Car. 182. 1788. 

 Phaseolus polystachyus B.S.P. Prel. Cat. N. Y. 15. 1888. 

 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 axil- 

 lary, usually numerous, peduncled, 4 / -i2 / long, nar- 

 row, loosely-flowered; pedicels 2 // -4 // long, minutely 

 bracted at the base; corolla purple, about 4" long; 

 pods stalked, drooping, somewhat curved, flat, i%'~ 

 2%' long, 4 // -5 // wide, 4-6-seeded, glabrous or nearly 

 so; seeds chocolate-brown, 3"-4" long. 



In thickets, Canada (Torrey and Gray), New England, 

 south to Florida, west to Minnesota, Nebraska and Louisi- 

 ana. July-Sept. Called also Wild Kidney Bean. 



45. STROPHOSTYLES Ell. Bot. S. C. & Ga. a: 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 (9 and i). 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. 



Leaflets mainly lobed, I'-a* long; pod 2' -3' long. i. S. helvola. 



Leaflets mainly entire, Vt'-iYt' long; pod i'-a' long. 



Flowers several, about 6" long; root perennial. 2. S. umbellata. 



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



i. Strophostyles helvola (I,.) Britton. Trailing 

 Wild Bean. (Fig. 2235.) 



Phaseolus helvolus L. Sp. PI. 724. 1753. 

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

 Phaseolus diversifoliiis Pers. Syn. 3: 296. 1807. 

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



Prostrate orlow-twining, rathcrrough-pubesceut, branched 

 at the base, 2-8 long, rarely erect and io'-2c/ high. 

 Root annual (always?); stipules narrowly lanceolate, \"- 

 2" long; leaflets broadly ovate, obtuse or acute at the 

 apex, rounded at the base, thickish, generally more or less 

 obtusely lobed, sometimes entire, i / -2 / long, the lower ones 

 often inequilateral; peduncles axillary, exceeding the peti- 

 oles; flowers 3-10, sessile, capitate; corolla greenish-purple, 

 4 // -6 // long; keel slender, curved; pod sessile, linear, nearly 

 terete, slightly pubescent, 2 / -3 / long; seeds oblong, pubes- 

 cent, 3" long. 



In sandy soil, eastern Massachusetts to Florida, west to Texas. 

 Also 1 along the Great Lakes from Quebec to Minnesota and 

 south in the Mississippi Valley. July-Oct. 



