562 Rydberg : Rocky Mountain flora 



glabrate above; peduncles 0.5— 1.5 dm. long; inflorescence race- 

 mose, 5-10 cm. long; bracts lanceolate, acuminate, 3—5 mm. 

 long ; pedicels very short ; calyx-tube nearly cylindric, about 5 

 mm. long, gibbous above, white-pubescent with short hairs ; 

 lower calyx-teeth subulate, about 1.5 mm. long; the upper 

 lanceolate, shorter and slightly broader; pod oblong, about 1.5 

 cm. long and 5 mm. thick, often sparingly hairy when young, in 

 age glabrous, almost terete, leathery, completely 2-celled. 



This species has been confounded with A. Mortoiiii and some- 

 times with A. canadensis. The former is found only in the Columbia 

 Valley region and is characterized by the intermixed black hairs on 

 the calyx, and by the more hairy pod which is distinctly sulcate 

 on the lower suture. A. orcopliihis is really closer related to A. 

 canadensis, but differs principally in the short bracts and calyx- 

 teeth. In A. canadensis the bracts are linear-lanceolate, long-at- 

 tenuate, the lower almost as long as the calyx, and the calyx- 

 teeth longer, fully half as long as the tube. A. oreopJiilus grows 

 in the foot hills at an altitude of 1,500-2,200 m. 



Colorado: Pagosa Springs, 1899, C. F. Baker ^rg (type); 

 near Boulder, 1902, F. Tzveedy 5134; Stone Prairie, Larimer 

 Co., 1897, G. E. OsterJiont; Wahatoya Creek, 1900, Rydberg & 

 Vreeland jggo ; Durango, 1898, Baker, Earle & Tracy ^yS. 



Astragalus Shearii sp. nov 



Perennials with horizontal rootstock ; stems slender, strigose 

 and striate, about 2 dm. high ; stipules triangular, strigose, free 

 from the petioles, but slightly united across the back of the stem ; 

 leaves 3-5 cm. long with 13-19 leaflets ; these 5-8 mm. long, 

 oblong, obtuse or retuse at the apex, glabrate above, grayish 

 strigose beneath ; peduncles 4—5 cm. long ; raceme short, 5—10- 

 flowered ; calyx-tube campanulate, about 4 mm. long, strigose, 

 partly with black hairs ; teeth triangular ; corolla reddish-purple, 

 nearly i cm. long; pod oblong, 12— 14 mm. long, glabrous, reticu- 

 late, sessile, almost terete in cross-section ; the lower suture in- 

 truded and forming a narrow partial partition. 



In general habit somewhat resembling A. Hallii ■d.\\<\ A.flex- 

 nosns, but the structure of the pod places it nearest to A. clegans. 



Colorado: Twin Lakes, 1896, C. L. Shear jjij. 



Homalobus Wolfii sp. nov. 



Low depressed cespitose perennial ; stems intricately branched, 

 less than i dm. long, covered by the scarious, strongly- veined, 



