506 rABACE.\E 



the middle, scarcely sulcate. A. eriocarpus S. Wats. Mountains: Nev. — 

 (? Utah). Submojd. My. 



20. X. utahensis (T. & G.) Rydb. Stems usually less than 1 dm. long, 

 densely floccose; leaflets 9-17, ofaovate or orbicular, rounded at the apex, 5-10 

 mm. long, densely white-floccose; raceme 3-10-fio\vered, dense; calyx densely 

 villous; tube about 12 mm. long; teeth subulate, about 4 mm. long; corolla 25- 

 28 mm. long, violet or purple; pod ovoid, about 2 cm. long, somewhat curved, 

 only slightly sulcate on the sutures. A. utahensis T. & G. A. nudisiliquus A. 

 Neis. Pink Lady-fingers. Hills and benclilands: Mont. — Wyo. — Utah — 

 Nev. Suhmont. Ap-My. 



21. X. Purshii (Dougl.) Rydb. Stems usually less than 5 cm. long, villous; 

 leaflets 9-13, oblanceolate or oblong, acute, 8-15 mm. long, villous; caljTc den.sely 

 villous; tube about 1 cm. long; teeth subulate, about 3 mm. long; corolla 2-2.5 

 cm. long, ochroleucous; keel tipped with purple; pod ovoid, densely woolly, 

 about 2 cm. long, slightly curved, scarcely sulcate. A. Purshii Dougl. A. 

 Booneanus A. Nels., in part. Dry plains and hills : Mont. — Colo. — CaUf. — B.C. 

 Son. — Suhmont. My-Je. 



22. X. glareosus (Dougl.) Rydb. Stems usually less than 1 dm. long; 

 leaflets 11-17, oblong, canescent-hirsute, 4—10 mm. long, acute; peduncles very 

 short; racemes 3-8-flowered; calyx-tube 8-9 mm. long; teeth subulate, 2 mm. 

 long; corolla purple, about 2 cm. long; pod villous, ovoid, about 2.5 cm. long. 

 A. glareosus Hook. A. Booneanus A. Nels., in part. Hills and flats: Wash. — 

 Mont. — Wyo. — Utah. Plam — Suhmont. My-Je. 



23. X. inflexus (Dougl.) Rydb. Stems 2-4 dm. long, decumbent, white" 

 villous; leaflets 15-25, obovate or elUptic to oblanceolate, 7-15 mm. long, white" 

 villous; raceme o-10-flowered, capitate, calyx long- villous ; tube 10-12 mm. long! 

 teeth subulate-setaceous, 6-7 mm. long; corolla light purple, 20-25 mm. long; 

 pod oblong-ovoid, strongly curved, villous, deeply sulcate on both sutures, 2.5 

 cm. long. .4. i/i.^cxws Dougl. Plains and river-bars: Wash. — Mont. — Ore. Son. 

 —Plain. My-Je. 



24. X. Parryi (A. Gray) Rydb. Stems 0.5-2 dm. long, hirsute-villous; leaf- 

 lets 15-27, obovate or oblong, 4—15 mm. long, sparingly hirsute on both sides; 

 raceme short, 6-10-flowered; calyx sparingly hirsute; tube 5-6 mm. long; teeth 

 4-5 mm. long; corolla ochroleucous, 15-18 mm. long; keel tipped with purple; 

 pod 2.5-3 cm. long, 7 mm. broad, long-beaked, arcuate, hirsute; lower suture 

 slightly more sulcate than the upper. Mountains: Wj-o. — Colo. — n Tex. Suh- 

 mont. — Mont. My-Jl. 



31. MICROPHACOS Rydb. 



Subcinereous perennials, with very slender stems. Leaves pinnate, with 7-21 

 linear to oblong leaflets; stipules very broad, triangular, free from the petioles and 

 only the lower more or less united with each other. Racemes many-flowered. 

 Calyx short-campanulate, about 2 mm. long, with very short and broad teeth. 

 CoroUa purple, 5-6 mm. long, all petals strongty curved. Pod 6-8 mm. long, 

 coriaceous, cross-wrinkled, wholly 1-celled, 6-7-ovuled, boat-shaped, i. e., upper 

 suture prominent, strongly curved, lower suture nearly straight or curved up- 

 wards, flat or slightly sulcate. 



Pod slightly sulcate on the lower suture, transversely veined; leaflets narrowly linear- 

 obtuse. 1. A/, parviflorus- 



Pod merely flattened on the lower suture, cross-wrinkled; leaflets linear-oblong or linear- 

 cuneate, truncate or emarginate. 2. M. microlobus. 



1. M. parviflorus (Pursh) Rydb. Stem minutely strigose, 3-6 dm. high; 

 leaflets 11-21; racemes verj' slender, lax; calyx-tube 1 mm. long; teeth triangular, 

 0.5 mm. long; corolla purplish, 5-6 mm. long; pod pendent, straight, ovoid, 5-7 

 mm. long. Astragalus gracilis Nutt. Plains and hills: N.D. — Tex. — Wyo. 

 Plain. Je-Jl. 



2. M. microlobus (A. Gray) Rydb. Stem branched, 3—4 dm. high, finely 

 strigose; leaflets 7-17, minutely strigose; raceme lax, short; calyx-tube 1.5-2 mm. 

 long; teeth triangular, 0.5 mm. long; corolla about 7 mm. long, purplish; pod 



