514 FABACEAE 



1 cm. long; keel with a deeply purple tip; pod 2-2.5 mm. long, 3 mm. wide, 

 minutely strigose or in age glabrous. A. serotinus A. Gray. Mountain slopes: 

 B.C. Wash. Mont. Submont. My-Jl. 



30. H. oblongifolius Rydb. Stems ascending, branched, 2-3 dm. high, 

 glabrous or nearly so; leaflets 11-19, usually oblong, but varying from elliptic 

 to linear-oblong, 1-2 cm. long, 3-6 mm. wide, glabrous above, sparingly strigose 

 beneath, rounded at the apex; raceme short, 5-10-flowered; calyx-tube 2-2.5 

 mm. long; teeth subulate, fully 1 mm. long; corolla 1 cm. long, white, tinged 

 with purple; keel with a narrow dark-purple tip; pod 2-2.5 cm. long, strigose, 

 4 mm. wide. Mountains: Colo. Mont. My-Je. 



31. H. decurrens Rydb. Stems erect, 3-4 dm. high, slightly strigose and 

 angled; leaflets 11-15, 2-4 cm. long, linear-oblong to oblanceolate, sparingly 

 strigose below, glabrate above; racemes slender, lax, 5-10-flowered; calyx-tube 

 about 2.5 mm. long; teeth nearly 2 mm. long and subulate; pod fully 2 cm. long 

 and 3 mm. wide, at length often glabrous. Wooded hills: Colo. Mont. Je-Au. 



32. H. paucijugus Rydb. Stems 1-2 dm. high, sparingly strigose; leaflets 

 1-5, the lateral ones lanceolate to linear-subulate, 1 cm. or less long, glabrous 

 above, sparingly strigose beneath, or none, the terminal one 1-2 cm. long, linear 

 or linear-oblanceolate; racemes short, 3-6-flowered; calyx strigose with black 

 hairs; tube about 2 mm. long; teeth subulate, fully 1 mm. long; pod 12-15 mm. 

 long, 2 mm. wide. Sheltered places in the mountains: Utah. Mont. Subalp. 



33. H. micrpcarpus Rydb. Stems decumbent, about 1 dm. high, strigose; 

 leaflets 9-15, elliptic to linear, 5-15 mm. long, 1-3 mm. w r ide, glabrous above, 

 sparingly strigose beneath; racemes short, 3-8-flowered; calyx strigose w r ith 

 black hairs; tube about 2 mm. lohg; teeth about 1 mm. long, subulate; pod 12- 

 IS mm. long, 3 mm. wide. H. camporum Rydb., in part. Mountains: Colo. 

 Submont. Mont. 



34. H. humilis Rydb. Stems 2-10 cm. long, grayish strigose, decumbent 

 or spreading; leaflets il-15, oblong, 3-6 mm. long, about 2 mm. wide, grayish 

 strigose beneath, glabrate above; raceme short, 3-8-flowered; calyx strigose with 

 black hairs; tube 1.5-2 mm. long; teeth triangular or triangular-subulate, 1-1.5 

 mm. long; corolla purple, 7-8 mm. long; pod about 1.5 cm. long, 3 mm. wide. 

 Mountains: Utah. Mont. Subalp. 



35. H. Palliseri (A. Gray) Rydb. Stems adsurgent, 2-4 dm. high, sparingly 

 strigose; leaves 8-12 cm. long; leaflets 9-19, linear or lance-linear, sparingly 

 strigose below, glabrate above, 1-2 cm. long; raceme 7-12-flowered, lax; calyx 

 strigose with black hairs; tube 2.5 mm. long; teeth triangular-subulate, 0.5 mm. 

 long; pod linear, about 1.5 cm. long, 2 mm. broad, glabrous, tapering at both 

 ends. Mountains: Alta. B.C. Wash. Mont. Submont. Jl. 



36. H. hylophilus Rydb. Stems slender, leafy, sparingly strigose; leaf- 

 lets 13-25, elliptic to lance-oblong, 1-2 cm. long, glabrous above, sparingly 

 strigose beneath; raceme short, 6-12-flowered; calyx strigose, with dark hairs; 

 tube 3 mm. long; teeth subulate, 1-1.5 mm. long; corolla about 1 cm. long, white, 

 tinged with purple at the tip; keel purple-tipped; pod linear, 2-2.5 cm. long, 

 3-4 mm. wide. Open woods: Mont. Wyo. Utah Ida. Submont. Mont. 

 Je-Au. 



37. H. stenophyllus (T. & G.) Rydb. Stem erect, glabrous, 5-7 dm. high; 

 leaflets 9-17, narrowly linear, glabrous or sparingly strigose, 1-1.5 cm. long, 1-2 

 mm. wide; raceme lax, many-flowered; calyx-tube 3-4 mm. long; teeth triangular, 

 1 mm. long; corolla ochroleucous or white, about 2 mm. long; stipe of the pod 

 about 1 cm. long; body oblong, about 2 cm. long, 4 mm. wide. A. stenophyllus 

 T. & G. Plains: Mont. B.C. Ore. (? Utah). Son. Plain. Je. 



38. H. Episcopus (S. Wats.) Rydb. Stems glabrous or slightly appressed- 

 hairy, 4-6 dm. high, branched; leaflets 0-7, narrowly linear, 8-12 mm. long, 

 sparingly strigose; raceme lax; calyx strigose, with more or less blackish hairs; tube 

 about 4 mm. long; teeth subulate, about 1 mm. long; corolla reddish purple, 

 12-15 mm. long; pod glabrous; stipe 5-8 mm. long; body linear-oblanceolate, 



