106 LEGUMINOS^E. (PUr.SE FAMUA'.) 



28. PHASEOLUS, L. Kidney-Bean. 

 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 stipcUate 

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

 axillary peduncles. 



* Flowers scattered in long racemes : legumes sq/milar-shaped. 



1. P. perenuis, Walt. Stem climbing, pubescent; leaflets ovate, acute, 

 entire, membranaceous ; racemes often brandling, 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-lobcd, strongly reticulate, rather rigid ; racemes 6-8 times as long 

 a.s the leaves, solitary, simple. — Dry sand ridges in the pine barrens. Florida. 

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



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

 seed scurfy. (Stkophostyles, Ell.) 



3. P. diversifolius, Pers. Annual ; stems prostrate or trailing, rough- 

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

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

 Stems 2° -4° long. Corolla purple, witliering greenish. 



4. P. helvolus, L. Perennial, smooth or hairy ; stems prostrate, leaflets 

 varj'ing from ovate to oblong-linear, rarely 3-lobcd ; peduncles 3-6 times as 

 long as the leaves. — Woods .ind 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-elcft. Vexillum depressed- 

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

 cluded in the keel, diadelphous, and with the style bent upward. Style hairy 

 above, appendagcd 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 lutcolus, Jacq.) — Brackish marshes, Florida to 

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



30. ERYTHRINA, L. 



Calyx tubular-campanulate, truncate, toothless. Vexillum nan-ow, straight, 

 elongated. Keel and wings very small. Stamens and style partly exsei-ted. 

 Legume stipitate, torulose, partly dehiscent. — Trees, shrubs, or rarely herbs, 

 often armed with prickles. Leaves trifoliolate, the terminal leaflet long-petiolu- 

 late. Flowers showy, scarlet, in long racemes. 



