512 FABACEAE 



12. H. wingatanus (S. Wats.) Heller. Stems 1-3 dm. high, finely strigose; 

 leaflets 7-13, linear to oblong, 5-15 mm. long, sparingly strigose beneath, gla- 

 brate above; raceme 7-12-flowered; calyx strigose, with mixed black and white 

 hairs; tube 1.5 mm. long; teeth subulate, 1 mm. long or less; corolla purplish, 6 

 mm. long; pod oblong, sessile, about 1 cm. long, 4 mm. wide. A. wingatanus 

 S. Wats. Dry hills: N.M. Colo. Utah. Submont. 



13. H. dementis Rydb. ' Stem glabrate or slightly strigose, about 2 dm. 

 high; leaflets 11-21, oblong or lanceolate, acute, 7-12 mm. long, glabrous above 

 and sparingly strigose beneath; inflorescence 8-12-flowered; calyx-tube about 3 

 mm. long, strigose with black hairs; teeth lanceolate-subulate, about half as long; 

 corolla bluish-purple, about 8 mm. long; pod oblong, about 1 cm. long, 3-4 mm. 

 wide, black-hairy, with very short hairs. Mountains: Colo. Mont. Jl. 



14. H. acerbus (Sheld.) Rydb. Stems erect, strigose, branched, 3-4 dm. 

 high; leaflets 5-7, linear, 4-20 mm. long, 1-2 mm. wide; raceme lax, 5-14-flowered; 

 calyx strigose; tube slightly over 1 mm. long; teeth triangular-subulate, 0.5 mm. 

 long; corolla 5 mm. long; legume glabrous; body oblong, 10-12 mm. long; stipe 

 about 1 mm. long. A. acerbus Sheld. Hills: Colo. N.M. Submont. Mont. 

 Je. 



15. H. Dodgeanus (M. E. Jones) Rydb. Stems slender, flexuose, 1.5-6 

 dm. high, minutely pubescent; leaflets 9-11, narrowly elliptic to linear, 5-10 

 mm. long; racemes lax; calyx strigose, with black hairs; teeth triangular; corolla 

 about 8 mm. long; keel purple-tipped; pod short-stipitate, linear-oblong. A. 

 Dodgeanus M. E. Jones. Rocky slopes: Utah Colo. Submont. My. 



16. H. dispar Nutt. Stem 3-4 dm. high, sparingly strigose or glabrate; 

 leaflets oblong to oval, rarely linear-oblong, obtuse, often mucronate, glabrous 

 above, sparingly strigose beneath, 8-20 mm. long; raceme 5-15-flowered; calyx 

 strigose or glabrous; tube 2 mm. long; teeth lance-subulate, 1 mm. long; corolla 

 8-10 mm. long; legume short-stipitate; body oblong, 10-13 mm. long, abruptly 

 contracted into the stipe. Hills and mountains: w Neb. Colo. Utah. Plain 

 Mont. Je-JL 



17. H. tenellus (Pursh) Britton. Stems erect, 2-4 dm. high, more or less 

 strigose, branched; leaflets 6-10 pairs, linear or linear-oblong, glabrous above, 

 more or less strigose beneath, 8-15 mm. long, 1-4 mm. wide; racemes 4-20-flowered ; 

 calyx strigose; tube nearly 2 mm. long; teeth triangular-subulate, 1 mm. long or 

 less; corolla 8-9 mm. long; body of the pod oblong, 8-12 mm. long, 3-5 mm. wide, 

 gradually tapering into the stipe. A. multiflorus (Pursh.) A. Gray. Hills and 

 mountain sides: Sask. Neb. Colo. Utah Yukon. Plain Mont. Je-Jl. 



18. H. stipitatus Rydb. Stems slender, 3-4 dm. high, erect; leaflets 9-15, 

 narrowly linear, 1-2 cm. long, 1-2.5 mm. wide, glabrous or sparingly strigose 

 beneath; racemes lax, 5-20-flowered ; calyx strigose; tube about 1.5 mm. long; 

 teeth subulate, about as long; corolla 8-10 mm. long; body of the pod oblong, 

 about 1 cm. long, 3 mm. wide, acute, gradually tapering into the stipe. Dry 

 hills: Sask. Minn. S.D. Plain. 



19. H. strigulosus Rydb. Stems erect or ascending, 1-3 dm. high, strigil- 

 lose; leaflets linear, acute, 8-12 mm. long, 1-2 mm. wide, thick, glabrous above, 

 strigose beneath; raceme lax, 4-7-flowered; calyx strigillose; tube 1.5 mm. long; 

 teeth subulate, less than 1 mm. long; corolla about 6 mm. long; body of the pod 

 oblong, 7-8 mm. long, 3 mm. wide, rather gradually contracted into the stipe, 

 which is about 3 mm. long. Dry places: Utah Nev. Son. 



20. H. debilis (Nutt.) Rydb. Stem 1-2 dm. long, sparingly strigose; leaf- 

 lets cuneate-oblong or elliptic, truncate or emarginate, minutely strigose beneath; 

 raceme short, subcapitate; calyx strigose, with grayish or blackish hairs; tube 

 2 mm. long; teeth subulate, about as long; corolla purple, 8-10 mm. long; pod 

 black-hairy, with rounded base, acute. A. debilis (Nutt.) A. Gray. Along 

 streams: Wyo. Ida. Yukon Mack. Boreal Mont. JL 



21. H. Bourgovii (A. Gray) Rydb. Stems numerous, decumbent or ascend- 

 ing, 0.5-3 dm. long, minutely strigose; leaflets oblong or elliptic to lance-linear, 

 4-12 mm. long, strigose; raceme lax, 3-10-flowered; calyx strigose, with black 



