498 FABACEAE 



4 mm. thick, glabrous. A. atropubescens Coult. & Fish. A. Kelseyi Rydb. 

 Hills: Mont. Son. Submont. Je-Jl. 



3. T. obscurum (S. Wats.) Rydb. Stem with a woody base, ascending, 

 2-3 dm. high, strigose; leaflets 11-15, oblong to oval, 5-10 mm. long, sparingly 

 strigose; peduncles 5-10 cm. long; racemes short; calyx strigose, with partly 

 black hairs; tube about 3 mm. long; teeth subulate, 1-1.5 mm. long; corolla yellow- 

 ish, about 1 cm. long; pod linear, about 2 cm. long, 3 mm. thick, strigose. A. 

 obscurus S. Wats. Dry regions: Ore. Ida. Nev. Calif. Son. My-Je. 



4. T. arrectum (A. Gray) Rydb. Stems several, 3-6 dm. high, more or 

 less strigose, striate; leaflets 25-31, linear to elliptic, obtuse, 8-16 mm. long, 

 grayish strigose on both sides or glabrate above; peduncles 1-2 dm. long; raceme 

 lax; calyx strigose with black hairs; tube 4-5 mm. long; teeth subulate, about 



2 mm. long; corolla white or nearly so, 12-15 mm. long; stipe of the pod 3-4 mm. 

 long; body oblong, 1.5-2 cm. long, 5 mm. broad. A. arrectus A. Gray. A. palou- 

 siensis Piper. A. Liebergii M. E. Jones. Hills: Ida. Wash. Ore. Son. 

 Submont. My-Je. 



5. T. Drummondii (Dougl.) Rydb. Stems 3-7 dm. high, villous; leaflets 

 25-31, elliptic to linear-oblong, obtuse, about 1 cm. long, glabrous or nearly so 

 above, softly long-villous beneath; peduncles 5-10 cm. long; raceme 3-10 cm. 

 long, at first dense, soon elongate; calyx hirsute- villous, with mixed black and 

 white hairs; tube 5-6 mm. long; teeth subulate, 1.5-2 mm. long; corolla 15-20 

 mm. long, cream-colored; stipe of the pod about 8 mm. long; body linear, 2-2.5 

 cm. long, glabrous, 3-4 mm. thick. A. Drummondii Dougl. Plains and hills: 

 Sask. Neb. Colo. Alta. Plain Submont. My. 



6. T. racemosum (Pursh) Rydb. Stems 3-6 dm. high, strigose; leaflets 

 15-31, pale green, linear or oblong, obtuse, 1.5-3 cm. long, glabrous above, 

 strigose beneath; peduncles about 1 dm. long; raceme lax, 1-2 dm. long, many- 

 flowered; calyx strigose; tube 5-8 mm. long; teeth subulate, 4-6 mm. long; 

 corolla white, 15-20 mm. long; stipe of the pod about 5 mm. long; body linear, 

 about 2.5 cm. long, 4 mm. broad, glabrous. A. racemosus Pursh. Plains and 

 hills: N.D. Okla N.M. Plain. 



7. T. scopulorum (Porter) Rydb. Stems 3-5 dm. high, strigose, angled; 

 leaflets 15-27, oblong to obovate or oval, glabrous above, sparingly strigose 

 beneath; peduncles 5-8 cm. long; raceme short, 5-10 cm. long; calyx-tube about 

 6 mm. long; teeth subulate, 3 mm. long; corolla ochroleucous, 15-20 mm. long; 

 stipe of the pod about 8 mm. long; body linear, curved, glabrous, 2.5 cm. long, 



3 mm. wide. A. scop ulorum Porter. A. rarus Sheld. A. subcompressus A. Gray. 

 Mountains, usually in open woods: Colo. Utah N.M. Submont. Mont. 

 My-Je. 



8. T. Rusbyi (Greene) Rydb. Stem branched, 3-6 dm. high, glabrous or 

 nearly so; leaflets 17-27, oblong, 5-15 mm. long, obtuse or truncate, sparingly 

 strigose below, glabrous above; raceme elongate, long-peduncled ; calyx-tube 

 black-hairy, about 2 mm. long; lobes subulate, less than 1 mm. long; corolla 

 yellowish or with purplish banner, 7-8 mm. long; pod straight, linear, about 2 

 cm. long, glabrous, with a broad, partial partition. A. Rusbyi Greene. Moun- 

 tains: Ariz. Utah N.M. Submont. My-Jl. 



9. T. alpinum (L.) Rydb. Stems decumbent or ascending, 1-3 dm. (rarely 



4 dm.) high, glabrous or nearly so; leaflets 13-25, oval or elliptic, obtuse or 

 retuse, 6-12 mm. long, pilose on both sides; peduncles 5-10 cm. long; raceme 

 short, 1-4 cm. long; calyx black-hairy; tube about 3 mm. long; teeth subulate, 

 1.5 mm. long; corolla 8-12 mm. long; stipe of the pod 3 mm. long; body oblong, 

 about 1 cm. long, 3 mm. thick. A. alpinus L. Alpine-arctic regions: Lab. 

 Vt. Colo. Ida. Alaska; Eurasia. Mont. Alp. Je-Au. 



10. T. sparsiflorum (A. Gray) Rydb. Stems slender, 1-3 dm. long, spar- 

 ingly strigose, diffuse; leaflets 9-13, obovate or suborbicular, rounded or retuse 

 at the apex, 3-6 mm. long, strigose beneath, glabrous above; peduncles 1-3 cm. 

 long; raceme short, 1-5 flowered; calyx black-hairy; tube short, 2 mm. long, 

 very oblique; teeth 1-1.5 mm. long, subulate; corolla white, tinged with violet, 



