520 FABACEAE 



15 mm. long; legume ovoid, 1 cm. long, densely villous, nearly half 2-celled. 0. 

 nana Nutt. Mountains: Mont. Wyo. Plain Submont. Je. 



8. A. Lagopus (Nutt.) Greene. Pulvinate perennial; leaflets 9-15, elliptic, 

 oblong or lanceolate, acute, 5-15 mm. long, loosely canescent; scape 2-7 cm. 

 long, silky villous, decumbent to erect; spike head-like; calyx densely long-vil- 

 lous; tube about 6 mm. long; teeth often dark, subulate, 3 mm. long; corolla 

 dark bluish purple; legume long- villous, oblong-ovoid, long-acuminate, 15 mm. 

 long or less, thin, half 2-celled. O. Lagopus Nutt. Dry hills and bench lands: 

 Mont. Wyo. Ida. Plain Submont. My-Je. 



9. A. podocarpus (A. Gray) Greene. Pulvinate perennial; leaflets 11-33,. 

 linear-lanceolate or oblong, 3-8 mm. long, acute; peduncles 1-3 cm. long, spar- 

 ingly hairy, 1-2-flowered; calyx dark, villous with white hairs; tube 6-7 mm. long; 

 teeth lanceolate, 2-3 mm. long; corolla dark bluish purple, about 15 mm. long; 

 legume stipitate, finely black-hairy; body ellipsoid, 15-20 mm. long, abruptly 

 contracted into a short beak. 0. podocarpa A. Gray. Arctic-alpine regions: 

 Lab. Alta Colo. Ida. B.C. Yukon. Subalp. Alp. Je-Jl. 



10. A. Hallii (Bunge) Rydb. Pulvinate perennial; leaflets 11-19, narrowly 

 oblong or lanceolate, densely silky-canescent, about 5 mm. long; peduncles 1-3 

 cm. long, grayish strigose; calyx black, villous with white hairs; tube scarcely 5 

 mm. long; teeth lanceolate; corolla bluish purple, about 1 cm. long. 0. Hallii 

 Bunge. High mountains: Colo. Subalp. Alp. Je. 



11. A. oreophilus (A. Gray) A. Nels. Pulvinate perennial; leaflets 7-llr 

 lanceolate or oblong, densely white-silky, 4-8 mm. long; peduncles 1-3 cm. long; 

 spike 3-8-flowered, capitate; calyx densely hirsute-villous , partly black-hairy; 

 tube about 5 mm. long; teeth subulate, 2-3 mm. long; corolla purple, 10-12 mm. 

 long; legumes papery, grayish villous, about 1 cm. long. O. oreophila A. Gray. 

 Mountains: Utah Ida. Mont. Subalp. Jl. 



12. A. Parryi (A. Gray) Greene. Pulvinate perennial; leaflets 15-19,. 

 oblong-lanceolate, 4-8 mm. long, acute, grayish silky-strigose; peduncles 1-5 cm. 

 long, decumbent or ascending, 1-4-flowered ; calyx villous, partly with black 

 hairs, 6-7 mm. long; teeth subulate, 3 mm. long; corolla purple, about 15 mm. 

 long; pod cylindric, coriaceous, densely canescent, about 2 cm. long, 6 mm. 

 thick. 0. Parryi A. Gray. High mountains: N.M. Colo. (? Mont. ). Mont. 

 Alp. Jl. 



13. A. argophyllus Rydb. Leaflets 7-11, linear-lanceolate, generally less 

 than 1 cm. long, silvery white, with appressed plibescence, mostly involute; 

 calyx silky villous, 6-7 mm. long; teeth subulate, 3-4 mm. long; corolla purple; 

 wings rather narrow, deeply emarginate; pod similar to that of the next, but 

 scarcely 15 mm. long. Dry hillsides: Mont. Submont. Je-Jl. 



14. A. Besseyi Rydb. Leaflets 11-25, oblong-lanceolate, 1-2 cm. long, actfte, 

 silky-canescent; scape 1-2 dm. high; spike dense, 3-5 cm. long; calyx silky-vil- 

 lous with long hairs; tube 5-6 mm. long; teeth subulate, 4-5 mm. long; corolla 

 purple, about 2 cm. long; wings very broad, deeply emarginate; pod ovate-oblong, 

 nearly 2 cm. long, 5 mm. thick, silky-villous, half 2-celled. 0. argentata Pursh, 

 not Pers. A. Blankinshipii A. Nels., in part. A. ventosus Greene. Dry hill- 

 sides: Mont. Wyo. Je-Jl. 



15. A. atropurpureus Rydb. Leaflets oval to oblong, canescently silky- 

 villous, 5-15 mm. long, obtuse or acute; scape 6-10 cm. long, loosely villous; 

 raceme short and head-like; calyx dark, villous, with mixed black and white 

 hairs; teeth black-hairy, subulate, 4 mm. long; corolla dark-purple, about 15 

 mm. long; wings deeply emarginate; pod ovoid, less than 1.5 cm. long, with a 

 spreading beak, villous, thin, half 2-celled. Mountains: Wyo. Submont. Jl. 



16. A. melanodontus Greene. Leaflets elliptic, often obtuse, 5-10 mm. 

 long, appressed silky; scape 1-2 dm. high, minutely strigose; raceme 2-3 cm. 

 long; calyx densely pubescent, with partly black hairs; tube 5 mm. long; teeth 

 lanceolate, 2 mm. long; corolla purple, about 12 mm. long; wings rather narrow, 

 slightly emarginate; keel with a porrect tip. Oxytropis Lambertii $ Hook. Dry 

 banks: Sask. Alta. Plain. 



