PEA FAMILY 527 



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

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

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

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

 trimcate 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 l-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. Sandhergi. 



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 \alIous-pubescent. 5. L. incanus. 



Tendrils usuaUj- well developed; plant more or less climbing. 

 Corolla le.ss than 18 mm. long. 



Leaflets Linear to oblong-elUptic, thick, veiny. 



Leaflets oblong-eUiptic. 6. L. coreaceus. 



Leaflets linear. 7. L. graminifolius. 



Leaflets broadly oval or ovate. 



Tendrils usuaUy 3-cleft; leaflets moderately flrm, strongly veined. 

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

 lets. 8. L. Schaffneri. 

 Stipules very smaU. in comparisoa 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 hnear. 



Leaflets roxmded-oval, obtuse or roimded and mucronate at 



the ape.x. 12. L. utahensis. 



Leaflets eUiptic, 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. lo. L. decaphyllus. 



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



CoroUa 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; coroUa about 20 mm. 

 long. 18. L. laetivirens. 



Tendrils reduced ; stipules narrow and small. 

 CoroUa about 15-20 mm. long. 



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



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



CoroUa 10-15 mm. long. 



Leaflets oval. 20. L. leucanlhus. 



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-fiow'ered ; corolla purple, 12-15 mm. long; pod hnear, 4-5 cm. long. Wet 

 places: Lab. — X.Y. — S.D. — Ore. — Alaska; Eurasia. Plain — Submoni. My- 

 Au. 



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

 erect; leaflets 5-10 cm. long, 2^ 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. 

 HUlsides and rocky groimd: Mont. — Ida. — Wash. Submoni. Je. 



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

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



