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 obhquely 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 Unear, more or less flattened, dehiscent, 2-valved. Seeds usually several. 



Corolla purple. 



Stem winged; leaflets linear, lanceolate, or oblong; flowers about 15 ram. 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. ornalus. 



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



Tendiils usually well developed ; plant more or less climbing. 

 Corolla less than IS mm. long! 



Leaflets Unear to oblong-elUptic, thick, veiny. 



Leaflets oblong-elUptic. 6. L. coreaceus. 



Leaflets linear. 7. L. graminifolius. 



Leaflets broadlj- oval or ovate. 



Tend'-ils usually 3-cleft; leaflets moderately firm, strongly veined. 

 .Stipuk's large, often half as long as the small, 1-3 cm. long leaf- 

 lets. 8. L. Schaffneri. 

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

 leaflets. 9. L. venosus. 

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

 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 ape.x. 12. L. utahcnsis. 



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



13. L. pauciflorus. 

 Leaflets narrowly Unear. 14. L. tenuior. 



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



Leaflets elUptic to oval. l.^j. L. decaphyllus. 



Leaflets linear-oblong or oblanceolate. 16. L. brachycalyx. 



Corolla wlute or yellowish. 

 TendrUs well developed. 



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



long. 17. L. nchroleucus. 



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

 long. 18. L. laelivirens. 



Tendrils reduced ; stipules narrow and smaU. 

 CoroUa about 15-20 mm. long. 



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



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



Corolla 10-15 mm. long. 



Leaflets oval. 20. L. leucanthus. 



Leaflets Unear. 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; coroUa 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 hnear or lance-Unear, 1.5-4 cm. long, 3-5 mm. wide, glabrous; peduncles 



