106 LEGUMlNOSiE. (pULSE FAMILY.) 



28. PHASEOLUS, L. Kidney-Bean. 



Calyx 5-toothed, the two u])pcr teeth more or less united. Keel of the corolla 

 spirally coiled or twisted. Stamens diadclphous. Legume linear or falcate, 

 few - many-seeded. — Twining or prostrate herbs, with trifoiiolatc stipellate 

 leaves. Flowers commonly large, racemed, or clustered at the summit of the 

 axillary peduncles. 



* Flfwers scattered in lonrj racemes : legumes so/milar-sftajyed. 



1. P. perennis, Walt. Stem dimhinfr, 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. Ij. — Leaflets 2' -4' long. Flowers purple. 



2. P. sinuatus, Nutt. Stem prostrate, smoothish ; leaflets small (1' long), 

 roundish or 3-lobc(l, strongly reticulate, rather rigid ; racemes 6-8 times as long 

 as the leaves, solitan,-, simple. — Dvy sand ridges in the pine barrens. Florida. 

 July and August, y. — Stem 8°- 12° long. Flowers pale purple. 



* * Flowers clustered at the summit of the peduncles : legume linear, ntarly terete : 

 seed scurfij. (SxRorHOSTYLES, Ell.) 



3. P. diversifolius, Pcrs. Annual ; stems prostiate or trailing, rough- 

 liairy ; leaflets ovate, entire or 2 - 3-lobcd ; peduncles twice as long as the leaves. 

 — Sandy soil, Florida to Mississippi, and northward. June -September. — 

 Stems 2° - 4° long. Corolla jjuqilc, withering greenish. 



4. P. hclvolus, 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 ficld.s, Florida to Mississippi, and 

 northward. June- September. — Corolla pale purple, 



29. VIGNA, Savi. 



Calyx 4-toothcd, the upper tooth broader, entire or 2-cleft. Vcxillum depressed- 

 orbicular, with thickened knobs near the base. Keel not twisted. Stamens in- 

 cluded in the keel, diadclphous, and with the style licnt upward. Style hairy 

 above, appendaged below the stigma. Legume nearly terete, somewhat torulosc, 

 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, Florida to 

 South Carolina, and west to Mississippi. July -September. 



30. ERYTHRINA, L. 



Calyx tubulnr-campanulafc, tnincatc, toothless. Vexillum narrow, straight, 

 elongated. Keel and wings very small. Stamens and stylo partly cxscned. 

 Legume sfipitntc, torulosc, partly dehiscent. — Trees, shrubs, or rnrely herbs, 

 often anncd witli pri<klcs. Leaves trifoliolate, the terminal leaflet long-petiolu- 

 late. Flowers nhuwy, scarlet, in long racemes. 



