146 FABACEAE 



Leaflets (tensely canescent. 10. A HallH. 



Leaflets 5-11, densely canescent. 11, A. oreophilus. 



IV. Parryani. 

 One species. 12. A. Parryi. 



V. Campestres. 

 Plant not viscid. 



Corolla piirple, rarely white. 

 Calyx with spreading hairs. 



Calyx white-hairy; corolla usually light purple. 



Plant loosely pubescent; peduncles with long spreading hairs. 



8. A. Lagopus. 

 Plant silky-canescent; peduncles with appressed hairs. 

 ■ Plajit low, densely cespitose; peduncles ascending, curved, less than 

 5 cm. high; spike capitate. 13. A. argophyllus. 



Plant taller, over 1 dm. high; spilce elongate. 



Calyx long-hairy; wings broad. 14. A. Besseui. 



Calyx short-hairy; wings narrow. 21. A. aWertinus. 



Calyx black-hairy; corolla dark, bluish purple. 



Plant white or grayish villous. 15. .4. alropurpureus. 



Plant silky, with appressed hairs, green. 16. A. melanodontus. 



Calyx with appressed hairs. 



Legumes about 3 cm. long, short-stipitate and long-acuminate; corolla over 2 



cm. long. 17. A. Bigelovii. 



Legume 2 cm. long or less, sessile. 



Legumes villous, a.lmost 2-celled: caudices densely white-hairy; corolla 12 



mm. long. 18. A. plaitensis. 



Legumes appressed-silky or short-liairy ; caudices not conspicuously white- 

 hairy. 

 Legume nearly 2^celled; leaves white-silky. 



Corolla 12—15 mm. long; wings sUghtly emarginate. 



19. A. monticola. 

 Corolla about 2 cm. long ; wings broadly and deeply emarginate. 



20. A. sericeus. 

 Legumes only half 2-celIed. 



Leaves white-silky beneath; corolla 15 mm. long; pod ascending. 



21. A. albertinus. 

 Leaves green or only slightly silky. 



Legumes spreading; leaves elliptic or oblong; corolla 15 mm. 



long. 22. A. dispar. 



Legumes erect or strongly ascending; leaflets lanceolate or Unear- 

 lanceolate, very acute. 

 Leaves spreading; pod 15 mm. long, abruptly contracted 

 into a short spreading beak; corolla 15 mm. long. 



23. A. anguslatus. 

 Leaves erect; pod 20 mm. long, long-acuminate, nearly 

 straight; corolla 18-20 mm. long. 24. A. Lambertii. 

 Corolla yellow, ochroleucous or white, with a purple spot on the keel. 



Peduncles decvimbent, curved, 1 dm. long or less. 25. A. alpicola. 



Peduncles erect_, 2 dm. high or more. 



Peduncles with long loose hairs. 26. A. villosus. 



Peduncles appressed-hairy. 

 Flowers 12-15 mm. long. 



Lower leaves with conspicuously shorter and broader leaflets; flowers 



more or less spreading. 22. A. dispar. 



Lower leaves similar to the upper or nearly so; flowers strongly ascend- 

 ing. 27. A. gracilis. 

 Flowers 18-25 mm. long; pods coriaceous. 



Corolla yellow; banner and wings narrower tbaji in the next, sUghtly 



notched; legume nearly 2-celled. 28. A. spicatus. 



Corolla white or straw-colored, banner and wings fully 1 cm. wide, 

 deeply notched; legume half 2-celled. 29. A. albifiorus. 



Plant more or less viscid. 



Calyx not black-hairy; pods abruptly acuminate; base of the plant with long yellow 



hairs. 30. A. viscidus. 



Calyx black-hairy; pods long-acuminate; base of the plant not yellow-hEilry. 



31. A. viscidulus. 

 VI. Verticillati. 



Bracts usually shorter than the flowers. 



Leaflets lance-oblong to elliptic, densely silky-pubescent. 32. A. Richardsonii. 



Leaflets linear-lanceolate, rather sparingly silky. 33. A. galioides. 



Bracts much exceeding the flowers. 34. A. splendens. 



38. GLYCYRRHIZA (Tourn.) L. Liqdohice. i. g. lepidoia. 



39. HEDYSARUM (Tourn.) L. Hedysarum. 



Calyx-teeth shorter than the tube; reticulations of the pods polygonal. 



Corolla sulphur-yellow; fruit glabrous. 1. //. sulphurescens. 



Corolla purple, rose, or rarely white. 



Fruit glabrous, except as to a few hairs on the margins; internodes 6-8 mm. long. 



2. H. americanum. 

 Fruit distinctly appressed-pubescent ; internodes 8-15 mm. long. 



