106 LEGUMINOS-S. (PULSE FAMILY.) 



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 stipellate 

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

 axillary peduncles. 



* Flowers scattered in long racemes : legumes sci/mitar-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. 1J. Leaflets 2' -4' long. Flowers purple. 



2. P. sinuatUS, Nutt. Stem prostrate, smoothish ; leaflets small (!' long), 

 roundish or 3-lobcd, 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. 1J. Stem 8- 12 long. Flowers pale purple. 



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

 seed scurfy. (STROPHOSTYLES, Ell.). 



3. P. diversifolius, Pcrs. 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. June - September. 

 Stems 2 - 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-lobcd ; 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. VexHlum 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, appcndagcd 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, Jacrj.) Brackish marshes, Florida to 

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



30. ERYTHRINA, L. 



Calyx tubular-campanulate, truncate, toothless. Vexillum narrow, straight, 

 elongated. Keel and wings very small. Stamens and style partly exserted. 

 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. 



