508 FABACEAE 



curved. Astragalus Forwoodii S.Wats. Hills: S.D.— Wyo.— Mont. SubmonL 

 — Mont, Je-Jl. 



4. A, lineare Rydb. Stem grayish strigose, often tinged with purple, 2-4 

 dm. high; leaflets 9-15, linear, 1-2 cm. long, 1-2 mm. wide, grayish strigose; 

 raceme short; calyx densely black-hairy; tube 3 mm. long; teeth 2 mm. long; 

 corolla about 8 mm. long, ochroleucous or tinged with purple; keel tipped with 

 dark purple; legume glabrous, stipitate; stipe 4-5 mm. long; body 25-28 mm. 

 long, convexly curved on both sutures, but much more strongly so on the upper. 

 Dry slopes: Man.— Alta.— Yukon. Boreal— Mont. Je. 



5. A. glabriusculum (Hook.) Rydb. Stem 2-4: dm. high; leaflets linear or 

 nearly so, 15-25 mm. long, glabrous or nearly so; raceme short, in fruit elongate: 

 calyx black-hauy; tube 3 mm. long; corolla ochroleucous, 8 mm. long; keel 

 tipped with dark purple; pod glabrous; stipe 4^5 mm. long; body 2 cm. long; 

 lower suture straight or nearly so. Phaca glabriuscula Hook, A, glabriusculus 

 A. Gray. Gravelly slopes: Alta.— S.D.-^Wyo, Submont.—Mont. Je. 



6. A. Macounii Rydb. Stem 5-6 dm. high, finely and sparingly strigose or 

 glabrate; leaflets 9-17, very thin, oblong or oval, 15-25 mm. long, obtuse, gla- 

 brous above, sparingly strigose beneath; calyx black-hairv; tube about 3 mm. 

 long; teeth 1 mm. long; corolla about 8 mm. long, cream-colored or white, tinged 

 with purple; stipe of the pod 2-3 mm. long; body acute at both ends, 15-18 mm. 

 long, 5 mm. w^de. Astragalus Macounii Rydb. Mountains: B.C.— Alta.— 

 Colo. *S abmont. — Mont, My-Jl. 



7. A. ibapense (M. E. Jones) Rydb. Stem slender, grooved, minutely 

 strigose; leaflets 1-7, elliptic or linear, the lower obtuse, the upper acute, 4-12 

 mm. long, minutely strigose, or the single one of the upper leaves 2.5-4 cm. long; 

 raceme 1-3-flowered; calyx strigose; tube 2 mm. long; teeth 1 mm. long; corolla 

 b mm. long white; keel purple-tipped; pod short-stipitate, 12 mm. long, 3 mm. 

 wide, densely strigose, flat; lower suture straight. Astragalus ibapensis M. E. 

 Jones. Mountains; w Utah. Je. 



8. A. elegans (Hook.) Rydb. Stem finely strigose or glabrous, erect or 

 decumbent at the base, 2.5-6 dm. high; leaflets 9-17, oblong to linear, 15-20 

 mm long, obtuse; raceme lax, 5-10 cm. long, in fruit even 15-20 cm. long; calyx 

 black-hairy; tube 2.5 mm. long; teeth 1 mm. long; corolla 6-8 mm. long, purple, 

 or ochroleucousand tinged mth purple; pod ellipsoid, pendent, slightly inflated, 

 sessile, black-hairy, 8-15 mm. long. Phaca elegans Hook. Astragalus oroboides 

 amencanus A. Gray. A. minor M. E. Jones. A. eucomus B. L. Robms. Moun- 

 tains and woods: Lab.— Que.— S.D.— Colo.— Ida.— Alta. Submont,—Alp, Je- 



til. 



9. A. Shearii Rydb. 



?lets 13-19. 5-8 mm. L 



and 



gra^^sh strigose beneath; raceme short, 5-10-flowered; calyx-tube about 4 mm. 

 long, strigose, partly with black hairs; teeth short; corolla reddish purple, nearly 

 1 cm. long; pod oblong, 12-14 mm. Iour, glabrous, reticulate, sessile. Astragalus 

 bheam Rydb. Mountains: Colo. Mont. Au. 



10. A. Brandegei (Porter) Rydb. Stems adsurgent or ascending, branched, 

 stngose; leaflets 9-11, distant, linear, obtuse, 5-15 mm. long, glabrous above, 

 strigose beneath; raceme short, 2-5-flowered; calyx strigose; tube scarcely 2 mm. 

 long; teeth 1 mm. long or less; corolla about 5 mm. long, white or cream-colored, 

 tinged with purple; legume oblong, 10-12 mm. long, strigose. A. Brandegei 

 Porter, Hills and bluffs: Colo.— Utah— Ariz. Submont, J^Jl. 



34. HOMALOBUS Nutt. 



_ Perennial herbs, with rootstocks or woody caudices. Leaves alternate, odd- 

 pmnate, or sometimes simple. Flowers racemose, purple or ochroleucous. Calyx 

 campanulate. Keel obtuse. Pod several- or many-seeded, usuallv narrow, 

 perfectly 1-celled, without trace of a partition, with both sutures prominent, 

 usually more or less compressed, often flat. 



