338 PAPILIONACEAE. [Von. II. 
44. PHASEOLUS ep. bla 72gcm 87 58- 
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 1); anthers all alike. Style longitudinally bearded; stigma oblique or 
lateral; ovary sessile or nearly so; ovules ©. 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. 
1. Phaseolus polystachyus (L.) B.S.P. 
Wild Bean or Bean Vine. (Fig. 2234.) 
Dolichos polystachyus L,. Sp. Pl. 726. 1753- 
Phaseolus perennis Walt, 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°-15° 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/-12’ 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, 1%/— 
214’ 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. 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 asin Phaseolus. Standard nearly orbicular; wings mostly 
obovate; keel strongly curved. Stamens diadelphous (9 and 1). 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, 1'-2' long; pod 2’-3' long. 1. S. helvola. 
Leaflets mainly entire, !s'-1!s' long; pod 1'-2' long. 
Flowers several, about 6’’ long; root perennial. 2. S. umobellata. 
Flowers few, about 3'’ long; root annual. 3. S. pauciflora. 
1. Strophostyles hélvola (L.) Britton. ‘Trailing 
Wild Bean. | (Fig. 2235.) 
Phaseolus helvolus \,. Sp. Pl. 724. 1753. 
Phaseolus angulosus Ort. Nov. Pl. 24. 1797- 
Phaseolus diz versifolins Pers. Syn. 2: oo 1807. 
Strophostyles angulosa Ell. Bot. S. C. 2: 229. 1822. 
Prostrate or low-twining, rather rough-pubescent, branched 
at the base, 2°-S° long, rarely erect and 10’-20’ high. 
Root annual (always ?); stipules narrowly lanceolate, 1//— 
2’’ long; leaflets broadly ovate, obtuse or acute at the 
apex, rounded at the base, thickish, generally more or less 
obtusely lobed, sometimes entire, 1’-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 along the Great Lakes from Quebec to Minnesota and 
south in the Mississippi Valley. July-Oct. 
