LEGUMINOS^E. 59 



15. LATH'YRIIS, L. EVERLASTING PEA. 



1. L. marit'imus, Bigel. (BEACH PEA.) Stem stout, about 

 a foot high. Leaflets 8-16, oval or obovate. Stipules broad- 

 ly halberd-shaped, about as large as the leaflets. Flowers 

 large, purple. Sea-coast, and shores of the Great Lakes. 



2. L. veno'sus, Muhl. (VEINY E.) Stem 2-3 feet high. 

 Leaflets 10-14. Stipides very small, slender, half arrow- 

 shaped. Flowers numerous. Shady banks, chiefly west- 

 ward and southward. 



3. L. OChroleu'CUS, Hook. (PALE E.) Stem slender. 

 Leaflets 6-8, smooth and glaucous. Stipules half heart- 

 shaped, large. Corolla yellowish-white. Chiefly northward. 



4. L. palus'tris, L. (MABSH E.) Stem slender, wing- 

 margined. Leaflets 4-8, lanceolate, linear, or narrowly 

 oblong, sharply mucronate. Stipules small, half arrow- 

 shaped. Corolla blue-purple. Moist places. Var. myrti- 

 folius has oblong-lanceolate leaflets, and pale purple flowers. 

 Upper stipules much larger than the lower ones. 



16. A'PIOS, Boerhaave. GROUND-NUT. WILD BEAN. 

 A. tubero'sa, Moench. Flowers brown-purple. A com- 

 mon twining plant in low grounds. 



17. STROPHOSTVLES, Ell. 



5. angulo'Sa, Ell. (Phase'olus diversifolius, Pers.) An- 

 nual. Stems 1-6 feet long. Leaflets ovate to oblong-ovate, 

 often with a rounded lobe at the base. Flowers greenish- 

 white and purplish, few, sessile, clustered on the long 

 peduncles. S. W. Ontario chiefly. 



18. AMPHICARP^'A, Ell. HOG PEA-NUT. 

 A. mono'iea, Nutt. Flowers white or purplish. Moist 

 thickets and river-banks. 



19. DESMO'DIUM, DC. TlCK-TREFOlL. 



* Pod raised on a stalk much surpassing the calyx, the latter slightly 

 toothed. Stipules bristle-form. 



1. D. nudiflo'rum, DC. Stem smooth, 4-8 inches high. 

 Leaves crowded at the summit of sterile stems. Flowers in 



