284 LEGUMINOSAE (PEA FAMILY) 



ally lower: leaflets 13-17: pod somewhat pubescent and usually evidently sul- 

 cate dorsally. Extending from Colorado to the far northwest. 



6. Astragalus nitidus Dougl. Hook. Fl. Bor. Am. 1: 149. 1834. Cinereous 

 with minute appressed pubescence, or glabrate: stems ascending or decum- 

 bent, rather stout, 1-4 cm. long: leaflets 15-21, oblong or narrower, 12-18 mm. 

 long: spike dense, oblong or subcapitate; flowers purplish, ascending: calyx- 

 t ul >e slightly villous, long-campanulate ; the setaceous teeth only half as long as 

 the tube: pod coriaceous, sessile, pubescent, straight, ascending, ovate-oblong, 

 somewhat triangular-compressed, with a dorsal sulcus, 2-celled. A. adsur- 

 gens. (A. adsurgens Pall, is Asian; A. terminalis Wats. Proc. Am. Acad. 

 17: 370. 1882.) From Colorado to Manitoba and Oregon. 



7. Astragalus sulphurescens Rydb. Bull. Torr. Bot. Club 28: 36. 1901. 

 Glabrate, pale green and somewhat caespitose: stems ascending, 2-3 dm. high: 

 leaflets 13-19, elliptic to oblong, mostly obtuse, 15-25 mm. long: spike dense, 

 rather long and cylindrical; flowers ascending: calyx white-strigose, with 

 scattered black hairs, its lobes as long as the tube: corolla light-yellow; th( 

 banner yellow and longer than the wings : pods with the dorsal suture inflexec 

 (obcordate in cross section), strigose with black hairs. Not infrequent; 

 Colorado. 



8. Astragalus hypoglottis L. Mant. 2: 274. 1771. Loosely pubescent 01 

 glabrate, branched from the base: the stems slender, diffusely procumbent or 

 ascending, 1-2 dm. long: stipules rather large, somewhat sheathing; leaflets 

 13-21, oblong, obtuse or retuse: flowers crowded, capitate: corolla violet or 

 purplish, 10-12 mm. long: pod triangular-compressed, sulcate dorsally, silky- 

 villous, sometimes profusely so, 6-8-seeded. (A: goniatus Nutt. T. & G. Fl. 

 N. Am. 1: 330. 1838; A. virgultulus Sheld. Bull. Geol. & Nat. Hist. Surv. 

 Minn. 9: 23. 1894.) In grassy places; New Mexico to Washington and Hud- 

 son Bay. 



8a. Astragalus hypoglottis bracteatus Osterh. Bull. Torr. Bot. Club 24: 256. 

 1899. Flowers white or ochroleucous; the bracts large and conspicuous, green, 

 spatulate. Colorado and Wyoming. 



9. Astragalus Nuttallianus DC. Prodr. 2: 289. 1825. Stems ascending or 

 erect, 7.5 to 45 cm. high, minutely pubescent: leaflets 11-15, elliptical or 

 oblong, obtuse or retuse: flowers few, subcapitate or sometimes solitary on 

 slender peduncles, light purple, small, 4 mm. long: pod coriaceous, linear, 

 glabrous, subcompressed, incurved near the base, sulcate dorsally, retic- 

 ulated. Southern Colorado to Texas and California. 



10. Astragalus calycosus Torr. in Wats. King's Rep. 66. 1871. Silvery- 

 sericeous and nearly acaulescent, with short branched caudex; the leaves and 

 peduncles spreading: leaflets 9-13, oblong or ovate, 3-10 mm. long, usually 

 subacute: peduncles basal, somewhat surpassing the leaves: calyx campan- 

 ulate; the tube longer than its triangular teeth: corolla ochroleucous and 

 purplish, or purplish throughout: pod sessile, pubescent, chartaceous, straight, 

 subcompressed, slightly sulcate dorsally, 2-celled, about 10-seeded. (A 

 brevicaulis A. Nels. Bull. Torr. Bot. Club 25: 9. 1898.) Gravelly ridges and 

 slopes; Wyoming to Nevada. 



10a. Astragalus calycosus scaposus Jones, Zoe 4: 26. 1894. Stouter and 

 with longer scapes: calyx-lobes very short: the corolla wings scarcely cleft. 

 iposus Gray; A. candicans Greene.) Southwestern Colorado to Ari- 

 zona. 



11. Astragalus diphys-us Gray, PI. Fendl. 34. 1849. Stems clustered on 

 the crown of a semifleshy root, spreading-assurgent, 1-3 dm. long, sub- 

 glabrous: leaflets 15-21, somewhat fleshy, obovate-oblong, slightly retuse: 

 peduncles MS long as the leaves: flowers in a dense short spike: calyx short- 

 pyiindrie: corolla blue or purple or rarely nearly white: pod membranous, 

 inflated, oval (-acuminate, somewhat didymous, 18-25 mm. long, incurved 



! many, shining. Utah and Colorado to New Mexico. 

 !_'. Astragalus ineptus Gray, Prpc. Am. Acad. 6: 525. 1868. Cinereous- 

 pnbesn-nl or ir la I. rale: stems spreading from the crown of the perennial root, 

 branrh. .1, 1 l ,lm. long: leaflets 11-19, oblong, emarginate, glabrous above, a 



