LEOUMINOS^; 59 



15. LATH'VKUS, L. EVERLASTHSG Pea. 



1. L. marit'imus, Bigel. (Beach Pea.) Stem stout, about 

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

 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. Stipules very small, slender, half arrow- 

 shaped. Flowers numerous. — Shady banks, chiefly west- 

 ward and southward. 



3. L. oehPOleu'eus, Hook. (Paie E.) stem slender. 

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

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



4. L, palus'triS, L. (Maksh E.) Stem slender, wing- 

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

 oblong, sharply muoronate. Stipules small, half arrow- 

 shaped. Corolla ijlue-purple. — Moist places. Var. myFtl- 

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

 Upper stipules much larger than the lower ones. 



16. A'PIOS, Boerhaave. GrEotJND-Nux. Wild Beak. 

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

 mon twining plant in low grounds. : 



17. STKOPHOSTK'IKS, 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. Ho& Pea-Ndt. 



A. mono'lea, Nutt. Flowers white or purplish. — Moist 



thickets and river-banks. 



19. DESMO'DIUM, DC. Tick-Trefoil. 



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

 toothed. Stipules bristle-form.' 



1. D. nudiflO'FUm, DC. Stem smooth, 4-8 inches high. 



Leaves crowded at the summit of sterile stems. Flowers in i 



