PEA FAMILY 527 



racemose (raceme sometimes 1-flowered), perfect. Calyx obliquely campanu- 

 late, gibbous at the base, its teeth nearly equal, or the upper shorter. Banner 

 obovate, emarginate, clawed; wings obliquely oblong, adherent to the shorter 

 curved keel. Stamens diadelphous (9 and 1), monadelphous below; tube usually 

 truncate at the apex. Style curved, flattened, hairy along its inner side. Le- 

 gumes linear, more or less flattened, dehiscent, 2-valved. Seeds usually several. 



Corolla purple. 



Stem winged; leaflets linear, lanceolate, or oblong; flowers about 15 mm. long. 



1. L. palustris. 

 Stem wingless. 



Racemes 1-flowered. 11. L, Torreyi 



Racemes several- to many-flowered. 



Tendrils much reduced; stem mostly erect. 



Leaflets 1 or 2 pairs; flowers 8-10 mm. long. 



Leaflets narrowly linear. 2. L, Sandbergi. 



Leaflets oval or oblong. 3. L. bijugatus. 



Leaflets 3 or 6 pairs; flowers 20-25 mm. long. 



Plant glabrous or nearly so. 4. L. ornatus. 



Plant decidedly villous-pubescent. 5. L. incanus. 



Tendrils usually well developed; plant more or less climbing. 

 Corolla less than 18 mm. long! 



Leaflets linear to oblong-elliptic, thick, veiny. 



Leaflets oblong-elliptic. 6. L. coreaceus. 



Leaflets linear. 7. L. graminifolius. 



Leaflets broadly oval or ovate. 



Tendrils usually 3-cleft; leaflets moderately firm, strongly veined. 

 Stipules large, often half as long as the small, 1-3 cm. long leaf- 

 lets. 8. L. Schaffneri. 

 Stipules very small in comparison with" the large 2-7 cm. long 



leaflets. 9. L: venosus. 



Tendrils simple; leaflets not strongly veined. 10. L. Nuttallii. 

 Corolla 2 cm. long or more. 



Stipules large and broad, about half as long as the leaflets. 

 Leaflets not linear. 



Leaflets rounded-oval, obtuse or rounded and mucronate at 



the apex. 12. L. utahensis. 



Leaflets elliptic, acute at both ends, cuspidate at the apex. 



13. L. pauciflorus. 



Leaflets narrowly linear. 14. L. tenuior. 



Stipules narrow, less than half as long as the leaflets. 



Leaflets elliptic to oval. 16. L. decaphyllus. 



Leaflets linear-oblong or oblanceolate. 16. L. br achy calyx. 



Corolla white or yellowish. 

 Tendrils well developed. 



Stipules laige and broad, often half as long as the leaflets; corolla about 15 mm. 



long. 17. L. ochroleucus. 



Stipules smaller, much less than half as long as the leaflets; corolla about 20 mm. 



long. 18. L. laelivirens. 



Tendrils reduced ; stipules narrow and small. 

 Corolla about 1520 mm. long. 



Leaflets ovate or oval or obovate. 19. L. obovatus. 



Leaflets linear or lance-linear. 4. L. ornatus. 



Corolla 10-15 mm. long. 



Leaflets oval. 20. L. leucanthus. 



Leaflets linear. 21. L. arizonicus. 



1. L. palustris L. Stem glabrous or nearly so, 3-6 dm. high; leaflets 2-4 

 pairs, 2.5-6 cm. long; tendrils usually branched; inflorescence 7-15 cm. long, 

 2-6-flowered; corolla purple, 12-15 mm. long; pod linear, 4-5 cm. long. Wet 

 places: Lab. N.Y. S.D. Ore. Alaska; Eurasia. Plain Submont. My- 

 Au. 



2. L. Sandbergi (White) Howell. Stem 2-3 dm. high, angled, glabrous, 

 erect; leaflets 5-10 cm. long, 2-4 mm. wide, glabrous; inflorescence 2-5 mm. long, 

 1-3-flowered; corolla purplish, about 1 cm. long, L. bijugatus Sandbergi White. 

 Hillsides and copses: Ida. Wash. Submont. My-Je. 



3. L. bijugatus White. Stem erect or decumbent at the base, 2-3 dm. 

 high, glabrous; leaflets thin, 2-5 cm. long, 6-12 mm. wide, mucronate; inflores- 

 cence 2-5 cm. long, 1-2-flowered; corolla purplish, 8-10 mm. long; pod 6-seeded. 

 Hillsides and rocky ground: Mont. Ida. Wash. Submont. Je. 



4. L. ornatus Nutt. Stem erect, glabrous or nearly so, 2-4 dm. high; leaf- 

 lets linear or lance-linear, 1.5-4 cm. long, 3-5 mm. wide, glabrous; peduncles 



