94 BOTANY. 



villous throughout with spreading hairs, very stout, a foot or two high: 

 leaflets 10 to 15 pairs, cuneate-oblong to linear, 6 to 9 lines long, often 

 retuse : flowers in long and long-peduncled racemes, ochroleucous, about 

 nine lines long, on rather slender pedicels : pods coriaceous, linear and 

 exsertly stipitate, an inch long, terete or somewhat compressed, with a deep 

 narrow dorsal furrow, and 2-celled or nearly so, smooth, nearly straight, 

 reflexed. — From the Saskatchewan to Nebraska and Colorado ; at Apex, 

 Colo., Wolf (215). 



Astragalus racemosus, Pursh (Fl. ii, 740). — Resembling the last, 

 but glabrous or somewhat appressed-pubescent: pedicels slender: pod some- 

 what broader and more compressed. — From Nebraska to Southern Colorado 

 and Idaho; at Apex (216) and South Park, Colo., Wolf (227, 251). 



Astragalus humistratus, Gray (PI. Wright, ii, 43).-^Perennial, some- 

 what villous-pubescent with mostly appressed hairs : stems slender, pro- 

 cumbent, a foot long or more: leaflets 5 to 10 pairs, linear-oblong, acute, 

 half an inch long : flowers nearly sessile in a loose long-peduncled raceme, 

 spreading, 4 lines long, purplish : calyx-teeth equalling or exceeding the 

 campanulate tube : pods coriaceous, sessile, pubescent, linear-oblong, half 

 an inch long, curved, somewhat compressed contrary to the sutures, nearly 

 2-celled, with a deep dorsal furrow, the ventral suture prominent. — New 

 Mexico to Sonora; in Western New Mexico, Loew (203). 



Astragalus gracilis, Nutt. (Gen. ii, 100). — Perennial, somewhat 

 appressed-pubescent, slender, erect or ascending, a foot high or more : leaf- 

 lets 3 to 5 pairs, narrowly linear, half an inch long or less : flowers veiy 

 small, white or purplish, in an elongated open long-peduncled spike: calyx- 

 teeth very short : pods coriaceous, sessile, pubescent and rugose, 2 or 3 lines 

 long, ovate-oblong and obcompressed, 1-celled, concave on the back, and 

 the ventral suture prominent. — From Minnesota to Arkansas and the Rocky 

 Mountains ; at Kit Carson, Colo., Wolf (248). 



Astragalus aboriginum, Richardson. (Phaca aboriginum, Hook. Fl. i, 

 143, t. 66.) — From Colorado and Northern Nevada to the Arctic Zone; 

 South Park, Wolf (249). 



Astragalus oroboides, Hornem., var. Americanus, Gray. — Allied to 

 the last ; more nearly glabrous : leaflets obtuse or retuse : flowers on longer 



