106 LEGUMINOSAX. (PULSE FAMILY.) - 
28. PHASEOLUS, L. Kipsrx-Brax. 
Calyx 5-toothed, the two upper teeth more or less united. Keel of the corolla 
spirally coiled or twisted. Stamens diadelphous. Legume linear or falcate, 
few - many-seeded. — Twining or prostrate herbs, with trifoliolate stipellate 
leaves. Flowers commonly large, racemed, or clustered at the summit of the 
axillary peduncles. 
* Flowers scattered in long racemes : legumes scymitar-shaped. 
1. P. perennis, Walt. Stem climbing, pubescent; leaflets ovate, acute, 
entire, membranaceous ; racemes often branching, twice as long as the leaves. — 
Low woods and margins of fields, Florida to Mississippi, and northward. July 
and August. )| — Leaflets 2'-4' long. Flowers purple. 
2. P. sinuatus, Nutt. Stem prostrate, smoothish ; leaflets small (1long), — - 
roundish or 3-lobed, strongly reticulate, rather rigid; racemes 6 -8 times as long — — 
as the leaves, solitary, simple. — Dry sand ridges in the pine barrens. Florida.  — 
July and August. J| — Stem 8? -12? long. Flowers purple. m 
* * Flowers clustered at the summit of the peduncles : legume linear, nearly terete: 
seed scurfy. (STROPHOSTYLES, Ell.) A 
3. P. diversifolius, Pers. Annual; stems prostrate or trailing, rough- 
hairy ; leaflets ovate, entire or 2 -3-lobed ; peduncles twice as long as the leaves. 
— Sandy soil, Florida to Mississippi, and northward. June- September. — 
Stems 29 -4? long. Corolla purple, withering greenish. 
4. P. helvolus, L. Perennial, smooth or hairy ; stems prostrate, leaflets 
varying from ovate to oblong-linear, rarely 3-lobed ; peduncles 3 - 6 times as 
long as the leaves. — Woods and margins of fields, Florida to Mississippi, and 
northward. June- September, — Corolla pale purple. 
29. VIGNA, Savi. 
Calyx 4-toothed, the upper tooth broader, entire or 2-cleft. Vexillum depressed- 
orbicular, with thickened knobs near the base. Keel not twisted. Stamens in- 
eluded in the keel, diadelphous, and with the style bent upward. Style hairy 
above, appendaged below the stigma. Legume nearly terete, somewhat torulose, 
the seeds separated by cellular tissue. — Twining herbs, with trifoliolate leaves, 
and racemose axillary flowers. 
1. V. glabra, Savi. Annual, hirsute; leaflets ovate or ovate-lanceolate ; — 
racemes on stout peduncles longer than the leaves; flowers yellow, crowded ; 
legume hirsute.  (Dolichos luteolus, Jacq.) — Brackish marshes, Floida t 
"AEN ae amd mnn Naa July - September. 
. ERYTHRINA, L. 
Calyx — UMS toothless. Vexillum narrow, straight, —— 
elongated. Keel and wings very small. Stamens and style partly E 
Legume stipitate, torulose, partly dehiscent. — Trees, shrubs, or rarely herbs, d 
€ varisinqreso Sc uitis 
-— *. o oe eo 
