466 FABACEAE 



2-4 cm. long; racemes 1-2 dm. long; bracts lanceolate, about equalling the calyx; 

 calyx hirsute; upper lip ovate, 5 mm. long, the lower lanceolate, 8 mm. long; 

 corolla blue or purple; banner glabrous, 10-11 mm. long, with a yellowish or 

 reddish spot; wings 11-12 mm. long; keel ciliate on the margin; pod 3-4 cm. 

 long, 4^6-seeded. Sandy bottoms and dry banks: Colo. — Utah — N.M. Sub- 

 mont. — Mont. Ap-Je. 



48. L. comatus Rydb. Stem 3-7 dm. high, pubescent with long spreading 

 silky hairs; leaflets narrowly oblanceolate, acute, 2.5-4 cm. long, green, pubescent 

 on both sides; raceme short and dense, 5-15 cm. long; bracts lanceolate-subulate, 

 equalling or exceeding the buds; calyx densely pubescent with spreading hairs; 

 lips almost equal, ovate-lanceolate, 6 mm. long; flowers 8-10 mm. long; coroUa 

 bluish purple, rarely white; banner slightly shorter than the broad wings; pod 

 about 4 cm. long, 4-8-seeded. (?) L. habrocomus Greene. Mountains: Colo. 

 — Utah. Mont. Je-JI. 



49. L. sericeus Pursh. Stem erect, 3-6 dm. high, densely silky-hirsute, 

 leafy; leaflets 5-10, narrowly oblanceolate, densely silky, acute, 3-7 cm. long; 

 raceme 1-2 dm. long, rather dense; calyx silky-hirsute; lower hp narrowly lance- 

 olate, 7-9 mm. long; upper lip ovate, 6-7 mm. long; corolla dark blue; banner 

 with a light spot, pubescent on the back; legume about 3 cm. long, 4-6-seeded. 

 Plains and hills: Ore. — Ida. — Wyo. — S.D. — Mont. Submont. My-Au. 



50. L. aphronosus Blankinship. Stems 2-4 dm. high, densely pubescent, 

 with short spreading hairs; leaflets 6-8, oblanceolate, densely silky on both sides, 

 2-3 cm. long, acute; raceme 5-10 cm. long, dense; calyx silky, with short spread- 

 ing hairs; lower lip linear-lanceolate, 6 mm. long; upper lip ovate, 5 mm. long; 

 corolla blue; banner with light spot, pubescent outside. Fields and plains: 

 Mont. Jl-Au. 



51. L. Bakeri Greene. Stems several, leafy, 6-10 dm. high, densely hir- 

 sutulous, with short spreading hairs; leaflets 7-9, oblanceolate, densely silky on 

 both sides, acute, 3-6 cm. long; raceme 1-2 dm. long; calyx densely silky-hirsute 

 with short hairs; lower lip linear-lanceolate, about 8 mm. long; upper lip ovate, 

 6 mm. long; corolla dark blue to reddish purple; banner with a light spot, spar- 

 ingly pubescent without; legume 2.5-3 cm. long, 5-6-seeded. L. arcentinus 

 Greene. Mountains: Colo. Submont. My-Je. 



52. L. cyaneus Rydb. Stem 4-9 dm. high, densely short-villous, very 

 leafy; leaflets 7-11, oblanceolate, 3-9 cm. long, glabrous or nearly so above, 

 almost velvety beneath, acute; raceme dense, 1.5-2 dm. long; calyx white-vel- 

 vety; lower lip about 8 mm. long; banner slightly hairy on the back, light blue, 

 with a light brownish spot at the center, about 8 mm. long; wings light blue, 

 about 1 cm. long; pod about 25 mm. long, 4-5-seeded. Mountains: Mont. Jl. 



53. L. dichrous Greene. Stem erect, about 1 m. high, densely pubescent 

 with short spreading hairs, leafy; leaflets 7-8, narrowly oblanceolate, 4-5 cm. 

 long, densely silky-canescent, acute; raceme lax, 1.5-3 dm. long; bracts lance- 

 olate, shorter than the buds; calyx densely pubescent, with short spreading hairs; 

 lower hp linear-lanceolate, 7 mm. long; upper lip ovate-lanceolate, 5 mm. long; 

 corolla 10-12 mm. long; banner shorter than the wings, pubescent without; 

 legume about 3 cm. long, about 5-seeded. Mountains: Colo. Submont. Je. 



54. L. flavicaulis Rydb. Stems several, densely pubescent, with short 

 yellowish spreading hairs, almost velutinous, 3-5 cm. high; leaflets 7-10, narrowly 

 oblanceolate, usually conduplicate, densely silky on both sides, acute, 2-4 cm. 

 long; racemes dense, 5-10 cm. long; bracts s\ibulate, shorter than the buds; 

 calyx villous: lower lip lanceolate, 7 mm. long; up])er lip ovate, 5-6 mm. long; 

 corolla about 10 mm. long; legume 2-2.5 cm. long, 3-4-seeded. River bottoms: 

 Wyo. — Utah. Submont. 



55. L. macrostachys Rydb. Stem 5-10 dm. high, puberulent and with 

 long silky spreading or reflexed hairs; leaflets 7-8, lincar-oblanceolate, acuminate, 

 3-6 cm. long, appressed-silky on both sides; raceme dense, 2-3 dm. long; calyx 

 velutinous; lower lip broadly lanceolate, obtuse, about 8 mm. long; upper hp 

 ovate, almost as long; corolla 10-12 mm. long, dirty white, tinged with blue; 



