552 FLORA. 



8. Astragalus Hypoglottis L. Purple Milk Vetch or Cock's. head. 

 (I. F. f. 2132.) Slender, branched ;it the base, 1.5-6 din. long. Stipules ovate- 

 Lanceolate, acute-. 4 nun. Long; leaflet- 17-25, oblong or elliptic, obtusish and 

 generally emarginate at the apex, rounded at the base, 6-15 mm, long; flowers 

 violet-purple, 12-21 nun. long, in dense heads; pods membranous, sessile, ovoid- 

 oblong, 9 11 mm. long. Kans. to Minn., Hudson Bay, Ne v. and Alaska. Also in 

 northern Europe and Asia. May-Aug. 



9. Astragalus Drummondii Dougl. Drummond's Milk Vetch. (I. F. f. 

 2133.) Erect, 3-6 dm. high, rather stout. Stipules ovate, long-acuminate, 6-11 

 mm. long; leaflets 19-33, oblong or sometimes oblanceolate, obtuse, narrowed at 

 the base, 11-21 mm. long; flowers yellowish-white or the keel purplish tinged, 17- 

 19 mm. long, in loose spikes; pod distinctly stipitate, cartilaginous, linear, pend- 

 ent, glabrous, grooved, about 5 cm. long ; calyx dark- pubescent above. Plains, 

 Neb. to Manitoba, Wyo. and the N. \V. Terr. June-July. 



10. Astragalus racemdsus Pursh. Racemose Milk Vetch. (I. F. f. 

 2134.) Stem somewhat zigzag, 3-6 dm. high. Stipules ovate-lanceolate, mem- 

 branous, 4-6 mm. long; leaflets 17-21, elliptic or linear-oblong, acutish or mucro- 

 nate, 2-3 cm. long; flowers 17-19 mm. long, in loose racemes; pedicels 2-4 mm. 

 long; pods linear-oblong, imperfectly 2-celled by the intrusion of the dorsal suture, 

 acute at each end, glabrous, stipitate, broadly sulcate, pendent, about 2.5 cm. long. 

 Plains, Neb. and Kans. to the N. W. Terr. June-July. 



11. Astragalus bisulcatus (Hook.) A. Gray. Two-grooved Milk Vetch. 

 (I. F. f. 2135.) Rather stout, 3-9 dm. high. Stipules membranous, ovate-lanceo- 

 late, acute, 9-13 mm. long; leaflets 17-27, oval or oblong, obtuse, narrowed at the 

 base, 17-25 mm. long; flowers 15-17 mm. long, in elongated narrow racemes; 

 peduncles longer than the leaves; pod linear, stipitate, deflexed, pointed, glabrous 

 at maturity, membranous, 13-21 mm. long. Neb. and Colo, to Mont, and the N. 

 W. Terr. June-Aug. 



12. Astragalus pectinatus (Hook.) Dougl. Narrow-leaved Milk Vetch. 

 (I. F. f. 2136.) Ascending, 3-6 dm. high, finely canescent or glabrate. Stipules 

 membranous, ovate- lanceolate, acute or acuminate. 9-11 mm. long; leaflets 11-21, 

 narrowly linear, acute, 1.5-8 cm. long; flowers 16-25 mm. long, in loose spikes; 

 standard much longer than the wings and keel; pod nearly terete, sessile, oblong, 

 pointed, glabrous, not furrowed, keeled along the upper suture, 12-17 mm. long. 

 Plains, Neb. and Kans. to the N. W. Terr. June-Aug. 



13. Astragalus lotiflorus Hook. Low Milk Vetch. (I. F. f. 2137.) 

 Silky-pubescent with white hairs; stems 2-8 cm. high. Stipules ovate, acumi- 

 nate, 3-4 mm. long; leaflets 7-15, oval or oblong, obtuse and sometimes mucronu- 

 late, narrowed at the base, 11-17 mm. long; flowers 9-13 mm. long, in rather 

 dense short spikes; peduncles sometimes very short; pod sessile, villous-pubescent, 

 ovoid-oblong, somewhat inflated, pointed, dehiscent, keeled along the straight 

 dorsal suture. Plains, Manitoba to Neb., Tex., Colo, and the N. W. Terr. June- 

 July. 



Astragalus lotiflorus Nebraskensis Bates. Whole plant densely hirsute. Central 

 Neb. 



14. Astragalus Missouriensis Nutt. Missouri Milk Vetch. (I. F. f. 

 2138.) Densely silky-canescent, tufted. 5-13 cm. long. Stipules ovate-lanceolate, 

 acute. 4 mm. bug; leaflets 7-21, elliptic or obovate, obtuse but sometimes mu- 

 cronate, 6-1 1 mm. long; (lowers few, violet-purple, 11-19 mm. long in loose heads 

 or short spike-; pod sessile, acute, oblong, pubescent, dehiscent, slightly keeled 

 along the ventral suture, transversely wrinkled, about 2.5 cm. long. Plains, Neb. 

 to the N. W. Terr., south to.N. Mex. May July. 



15. Astragalus Shortianus Nutt Short's Mil k Yi.tcii. (T. F. f. 2139.) 

 Silvery canescent Stipules ovate, acutish, alwut 4 mm. long; leaflets 9-15, 

 elliptic or obovate, acutish, 11 19 mm. long; flowers bine or violet. 15-19 mm. 

 long; pod sessile, dehiscent at maturity, lanceolate-ovoid, puberulcnt. transversely 

 wrinkled, strongly curved at the summit. 2.5-4 cm. long. Plains. Neb. and Colo, 

 to N. Mex. May-July. 



16 Astragalus gracilis Nutt SLENDER Mii.k VeTCH. (I. F. f. 2140.) 

 Slender, finely pubesi m. high. Stipules ovate, acute or acuminate, 



