522 FABACEAE 



25. A. alpicola Rydb. Depressed acaulescent perennial; leaflets 9-13, 

 oblong or elliptic, obtuse or acutish, 5-8 mm. long, white silky-strigose ; scapes 

 2-6 cm. long, strigose; spike short, 3-8-flowered, subcapitate; calyx usually 

 very dark from the intermixed black hairs; tube 5-6 mm. long; teeth subulate, 



2 mm. long; corolla ochroleucous, about 15 mm. long; wings broad and broadly 

 emarginate; pod about 15 mm. long, subcoriaceous, ovoid, short-beaked, nearly 

 2-celled. High mountains: Alta. Mont. B.C. Mont. Alp. Je-Au. 



26. A. villosus Rydb. Leaflets 25-31, rather crowded, 1-1.5 cm. long, 

 lanceolate, very acute, densely but somewhat loosely silky; scape about 1.5 dm. 

 long, loosely silky; spike dense, 4-5 cm. long; calyx white silky-villous; tube 6 

 mm. long; teeth very short, about 2 mm. long; corolla ochroleucous, without any 

 purple, 12-15 mm. long; pod thin, almost perfectly 2-celled, white-silky, about 

 1.5 cm. long. A. invenustus Greene. Hills: Mont. S.D. Submont. Mont. 

 Je. 



27. A. gracilis A. Nels. Leaves erect; leaflets 21-31, oblong-lanceolate, 

 appressed-silky, 1-2.5 cm. long, acute; scapes 2-4 dm. high; spike elongate, 5-10 

 cm. long; calyx densely silky, sometimes somewhat blackish; tube 6-7 mm. long; 

 teeth linear-subulate, 3-4 mm. long; corolla ochroleucous, about 15 mm. long; 

 wings slightly emarginate; pod oblong-ovate, about 2 cm. long, semi-membran- 

 ous, nearly 2-celled. A. albertinus Greene, in part. Open woodlands: Man. 

 S.D. Ida. Alta. Submont. Mont. Je-Jl. 



28. A. spicatus (Hook.) Rydb. Leaflets oval to oblong, 8-25 mm. long, 

 4-8 mm. wide, usually obtuse, silky-strigose; scape 1-1.5 dm. long; spike 4-10 

 cm. long; calyx silky-strigose, often with intermixed black hairs; tube 6-7 mm. 

 long; teeth lanceolate, 3 mm. long; corolla 18-20 mm. long; pod short-hairy, 

 often with some black hairs, oblong, about 2 cm. long. 0. campestris spicata 

 Hook. A. cervinus Greene. A. Macounii Greene. Plains and hills: Sask. 

 S.D. Wyo. Alta. Plain Mont. My-Jl. 



29. A. albiflorus A. Nels. Leaflets 13-21, oblong, elliptic, or lanceolate, 

 1.5-2.5 cm. long, grayish strigose; scape 1.5-3 dm. long; spike elongate, 5-10 

 cm. long; calyx silky, with intermixed black hairs; tube 7-8 mm. long; teeth 

 lanceolate, 3 mm. long; corolla 2-2.5 cm. long; keel with a deep purple blotch; 

 pod densely pubescent, oblong, about 2 cm. long, rather abruptly acuminate, 

 about half 2-celled. A. saximontanus A. Nels. A. majusculus Greene. Plains: 

 Mont. Colo. Submont. Mont. My-Jl. 



30. A. viscidus (Nutt.) Greene. Leaflets 31-57, oblong-lanceolate, acute 

 or rarely ovate and rounded at the apex; scape 5-15 cm. long, erect, hirsute- 

 villous; spike 3-8 cm. long, calyx villous; tube about 5 mm. long; teeth subulate, 



3 mm. long; corolla violet, rarely white, about 12 mm. long; pod oblong, ovoid, 

 12-15 mm. long, minutely pubescent; partition narrow. 0. viscida Nutt. Moun- 

 tains: Mont. Wyo. Nev. Mont. Jl-Au. 



31. A. viscidulus Rydb. Leaflets 17-31, oblong, obtuse or acutish, 5-10 

 mm. long, sparingly villous; scape 0.5-2 dm. high, sparingly silky-villous; spike 

 dense, 2-5 cm. long; calyx densely hairy, viscid and more or less blackish; tube 

 about 5 mm. long; teeth lanceolate, 2.5 mm. long, glandular; corolla dark bluish 

 purple, with yellowish base, about 12 mm. long; pod membranous, oblong-ovate, 

 1-1.5 cm. long, finely black-hairy, about half 2-celled. Hills and mountains: 

 Alta. Wyo. Utah Yukon. Mont. 



32. A. Richardsonii (Hook.) Greene. Leaflets numerous, verticillate, 

 elliptic to lance-oblong, acute or obtuse, 8-20 mm. long, densely silky; scape 1-2 

 dm. high, villous; spike dense, 5-10 cm. long; bracts linear or lanceolate, often 

 obtuse; calyx densely villous; tube 5 mm. long; teeth 2 mm. long; corolla dark 

 blue, 10-12 mm. long; legume ovoid, densely villous, 12-15 mm. long, prac- 

 tically 2-celled. O. splendens Richardsoni Hook. Mountains: Sask. Colo. 

 Yukon. Submont. Mont. Je-Au. 



33. A. galioides Greene. Leaflets rather sparingly silky, numerous, verti- 

 cillate, linear-lanceolate, very acute, 5-15 mm. long; scape slender, 2-3 dm. high, 

 villous; spike 5-10 cm. long, rather lax; bracts narrowly linear or subulate; 



