494 FABACEAE 



2. A. Bigelovii A. Gray. Stems less than 1 dm. long, ascending or de- 

 cumbent, densely villous; leaves mostly basal; leaflets 15-25, broadly obovate 

 or oval, 7-20 mm. long, densely silky-villous; raceme short; calyx-tube 7-8 mm. 

 long, villous; teeth subulate, 3 mm. long; corolla 15-18 mm. long, bright purple; 

 pod elongate-ovoid, curved upwards, 1.5 cm. long. Plains: Tex. Colo. Ariz.; 

 Mex. Son. Ap-Je. 



3. A. Thompsonae S. Wats. Stem very short, densely villous; leaflets 

 11-31, oblong to obovate, 4-8 mm. long, densely villous on both sides; racemes 

 rather dense; calyx-tube cylindric, 8-10 mm. long; teeth subulate, 2-3 mm. 

 long; corolla purple, nearly 2 cm. long; legume obliquely ovoid, somewhat curved, 

 12-16 mm. long, acuminate. Dry regions: Utah. Son. My. 



4. A. anisus M. E. Jones. Stems short, usually less than 1 dm. long, silky- 

 pubescent; leaflets 7-13, silky-pubescent, obovate or oval, 4-6 mm. long; pedun- 

 cles longer than the leaves; calyx-tube broadly cylindric, 8 mm. long; teeth sub- 

 ulate, very short; pods oval, obtuse at each end, finely corrugated, usually some- 

 what sulcate on both sutures. Dry plains: Colo. Son. 



6. A. canadensis L. Stem erect or ascending, 3-12 dm. high, sparingly 

 strigose; leaflets 15-25, elliptic, oblong, or oblong-lanceolate, 2-4 cm. long, 

 usually obtuse at the apex, strigose on both sides or glabrate above; peduncles 

 5-10 cm. long; raceme 5-20 cm. long; calyx-tube strigose, 5 mm. long; teeth 

 subulate, the upper 1.5 mm., the lower 2 mm. long; corolla ochroleucous, about 

 12 mm. long; pod oblong, 1-1.5 cm. long. River banks and hillsides: Que. 

 Fla. Utah B.C. Plain Submont. Je-Au. 



6. A. oreophilus Rydb. Stem sparingly strigose, 3-6 dm. high; leaflets 

 7-23, oblong or elliptic, about 3 cm. long, strigose on both sides or glabrate 

 above; inflorescence 5-10 cm. long; calyx-tube about 5 mm. long, gibbous above, 

 white-pubescent; lower calyx-teeth subulate, about 1.5 mm. long, the upper 

 Ipnceolate, shorter and slightly broader; pod oblong, about 1.5 cm. long and 5 mm. 

 thick. Hills, among bushes: Colo. Submont. Jl-Au. 



7. A. Mortoni Nutt. Stem 3-6 dm. high, sparingly strigose or glabrate; 

 leaflets 9-21, elliptic or oval, obtuse, rounded, or emarginate at the apex, 1.5-3.5 

 cm. long, strigose beneath; peduncles 1-2 dm. long; raceme short and dense, 2-5 

 cm. long; calyx-tube 4-5 mm. long; lower teeth subulate, 1.5 mm. long, the 

 upper ones lanceolate, 1 mm. long; corolla ochroleucous, 12-15 mm. long; pod 

 cylindric, 1.5 cm. long, 4-5 mm. thick. River banks: B.C. Mont. n Calif. 

 Son. Submont. Je-Au. 



8. A. spicatus Nutt. Stems 2-4 dm. high, strigose; leaflets oblong to oval, 

 obtuse or rounded at the apex, 1-2.5 cm. long, strigose on both sides or glabrate 

 above; peduncle 1-1.5 dm. long; flowers often reflexed; calyx-tube 6 mm. long; 

 lower teeth subulate, 2 mm. long, the upper ones triangular, 1.5 mm. long; 

 corolla ochroleucous, 12-15 mm. long; pod cylindric, 1 cm. long, 4-5 mm. thick. 

 A. Mortoni Coult., not Nutt. Meadows: Mont. S.D. Wyo. Nev. Ida. 

 Submont. Mont. Je-Au. 



9. A. ursinus A. Gray. Stem erect, flexuose, 3 dm. high or more, stria te, 

 sparingly strigose; leaflets 11-15, obovate, emarginate, 8-10 mm. long, glabrous 

 or nearly so; peduncles 3-6 cm. long; racemes 2-5 cm. long; tube about 3 mm. 

 long; upper teeth triangular, 0.5 mm. long, the lower more subulate, nearly 1 

 mm. long; legume oblong, about 1 cm. long, terete, slightly curved. Valleys: 

 Utah. Son. 



10. A. terminalis S. Wats. Stem slender, 1.5-3 dm. high, strigose-canescent; 

 leaflets 13-15, linear-oblong to oblong-obovate, obtuse, 6-10 mm. long, strigose- 

 canescent; racemes open; flowers reflexed; corolla purplish, about 1 cm. long; 

 pod coriaceous, sessile, straight, narrowly oblong, about 12 mm. long. Gravelly 

 banks: Mont. Submont. Jl. 



11. A. striatus Nutt. Stems 1-4 dm. high, strigose, decumbent or ascend- 

 ing; leaflets 9-19, oblong or elliptic, acute or obtuse, 1-2 cm. long, grayish stri- 

 gose; peduncles 7-10 cm. long; spike dense, 2-6 cm. long; calyx-tube 5 mm. long, 

 strigose, with mixed black and white hairs; teeth subulate, 2-3 mm. long; corolla 



