528 FABACEAE 



about 5 cm. long; raceme 3-5-flowered; corolla purple or rarely yellowish, 2-2.5 

 cm. long; pod 4-5 cm. long. Plains and prairies: S.D. Okla. Colo. Wyo. 

 Plain Submont. My-Jl. 



5. L. incanus (Smith & Rydb.) Rydb. Stem erect, 1-3 dm. high, more or 

 less densely villous with short hairs; leaflets 3-4 pairs, linear or linear-oblong, 

 1-4 cm. long, 3-5 mm. wide, usually densely villous with short hairs; corolla 

 as in the preceding; pod 3-4 cm. long. L. ornatus incanus Smith & Rydb. Dry 

 sandy plains: Neb. Colo. Wyo. Plain Submont. My-Jl. 



6. L. coreaceus White. Stem flexuose, quadrangular, 2-6 dm. high, gla- 

 brous; leaflets 3-6 pairs, thick and coriaceous, strongly venulose, elliptic to 

 linear-lanceolate, 3-6 cm. long, 6-15 mm. wide; tendrils branched, but usually 

 short; inflorescence 1 dm. long or less, 3-10-flowered; corolla 10-15 mm. long, 

 purple or nearly white. Open woodlands, in the mountains: Utah Ore. Nev. 

 Submont. Mont. Je-Jl. 



7. L. graminifolius (S. Wats.) White. Stem erect, 3-6 dm. high, nearly 

 terete, glabrous; leaflets 1-3 pairs, narrowly linear, 5-10 cm. long, 1-3 mm. wide, 

 glabrous, firm; tendrils of the lower leaves reduced, of the upper ones branched; 

 raceme 2-4-flowered; corolla about 1 cm. long; pod linear, 4-6 cm. long. Hill- 

 sides: N.M. Utah Ariz. Submont. My-S. 



8. L. Schaffneri Rydb. Stem angled, glabrous, erect or decumbent, 3-6 

 dm. long; leaflets 4-6 pairs, oval or rhombic-oval, or elliptic, 1-3 cm. long, thick 

 and veiny; peduncles 5-10 cm. long; raceme 6-12-flowered; corolla purple, 12-18 

 mm. long; pod 3-4 cm. long, glabrous. L. parviflorus S. Wats. Meadows: 

 s Utah Calif. Mex. Son. Je-S. 



9. L. venosus Muhl. Stem 6-10 dm. high, erect, usually finely villous, 

 4-angled; leaflets 4-7 pairs, oval, often very veiny, glabrous above, finely pubes- 

 cent beneath; peduncles 5-10 cm. long; raceme short and dense, 12-16-flowered; 

 corolla purple, 12-15 mm. long; pod 4-5 cm. long, glabrous. River banks and 

 wet places: Ont. Ga. La. Kans. Mont. Sask. Plain Submont. My-Jl. 



10. L. Nuttallii S. Wats. Stem 3-6 dm. high, more or less villous-pubes- 

 cent, angled; leaflets 3-6 pairs, elliptic or oval, acutish, 2-4 cm. long, 1-2 cm. 

 wide, nearly glabrous above, more or less villous beneath; peduncles 3-6 cm. 

 long; raceme 3-6-flowered, short; corolla purple, 12-16 mm. long; pod glabrous, 

 2.5-4 cm. long. Woods and meadows: Calif. Ida. B.C. Submont. Ap-Jl. 



11. L. Torreyi S. Wats. Stem decumbent, branched from the base, pubes- 

 cent, 1-3 dm. high; leaflets 4-6 pairs, broadly oval, 5-15 mm. long, mucronate, 

 villous-pubescent on both sides; tendrils reduced to short tips; corolla about 1 

 cm. long, blue with white keel; pod oblong, 2.5-3 cm. long. Woods: W^ash. 

 Calif. Ida. Ap-Jl. 



12. L. utahensis M. E. Jones. Stem angled, glabrous, about 1 m. high or 

 more; leaflets 4-6 pairs, broadly oval, 2-5 cm. long, 1-3 cm. wide, firm and veiny, 

 glabrous; peduncles 5-15 cm. long; racemes 3-8-flowered; corolla purple, rarely 

 white, about 2 cm. long; pod glabrous, 5-6 cm. long. L. Bradfieldianus A. Nels. 

 Woods: Ida. Utah Colo. Submont. My-Jl. 



13. L. pauciflorus Fernald. Stem glabrous, 4-6 dm. high or more, angled; 

 leaflets 3-6 pairs, thick, veiny, elliptic, acute and cuspidate, 1-4 cm. long; ped- 

 uncles 5-10 cm. long; raceme 2-5-fl owered ; corolla about 2 cm. long; pod 5-6 cm. 

 long. Hillsides: Wash. Ida. Ore. Son. Submont. Ap-Je. 



14. L. tenuior (Piper) Rydb. Stem flexuose, 3-6 dm. high, glabrous, 

 angled; leaflets 3-5 pairs, narrowly linear, 3-7 cm. long, 4-10 mm. wide, glabrous 

 or nearly so; peduncles 5-10 mm. long; raceme short, 2-5-flowered; corolla 

 purple, about 2 cm. long; pod glabrous, about 4 cm. long. L. pauciflorus tenuior 

 Piper. Hillsides: Ore. Ida. Wash. Son. Submont. Je. 



15. L. decaphyllus Pursh. Stem erect, 2-5 dm. high, angled; leaflets 2-5 

 pairs, thick and veiny, elliptic or lance-oblong, acute, somewhat glaucous, gla- 

 brous, or finely pubescent beneath; stipules of the lower leaves reduced; peduncles 



