462 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



*Crepis atribarba f Heller, Bull. Torr. Bot. Club, 26: 314. 



Resembles most C. intermedia and C. barbigcra, but differs from 

 both in the more tapering achenes, and from the first also in the presence 

 of hairs or barbs on the involucre. In C. atribarba the barbs are 

 black, very slender, and scattei-ed all along the midrib of the bracts, 

 while in C. barbigera they are stouter, greenish yellow, and crowded 

 at the end of the bracts. It grows at an altitude of 1000-2000 m. 



Montana: Spanish Basin, June 28, 1897, Rydberg & Bessey, 

 S3 08. 



* Crepis pumila. 



Rather low and stout, generally with two stems or more from the 

 same root, 1.5-2 dm. high, grayish villous-pubescent, leafy; leaves 

 broadly lanceolate, laciniate-pinnatifid with lanceolate-triangular 

 lobes, acuminate, 8-10 cm. long ; basal leaves with a winged petiole, 

 the stem-leaves sessile ; corymbs narrow, with short erect branches ; 

 heads about 12 mm. high and 5-8 mm. broad : principal bracts about 

 10, linear or linear-lanceolate, grayish villous-puberulent, without 

 glandular hairs or barbels ; achenes cylindric, not at all tapering up- 

 wards, very sharply angled. 



In habit it most resembles C. occidentalism but lacks the black hairs 

 on the involucre characteristic of that species ; the heads are also 

 much smaller and the achenes different. From C. inter77icdia it differs 

 in the low habit, and in the form of the achenes, which in the latter 

 taper upward. 



On dry hillsides, at an altitude of 1500-2500 m. 



Montana : Somewhere between Fort Benton and Walla Walla, 

 Jo/in Pear sail (\A. Mullan's Expedition), gij; Bridger Mountains, 

 June 14, 1897, Rydberg & Bessey, sjoj (type). 



Idaho: Beaver Canon, 1895, Rydberg. 



Wyoming : Cement Creek, 1897, Tweedy, 612. 



Crepis occidentalis Nutt. Journ. Acad. Sci. Phila. 7: 29 [111. Fl. 3: 



282 ; Syn. Fl. i" : 432 ; Bot. Cal. i : 435] . 



Valleys and hillsides, at an altitude of 1000-2500 m. 



Montana: Great Falls, 1885, R. S. Williams: Spanish Basin, 

 June 24, 1897, Rydberg d' Bessey, 3307 ; Bridger Mountains, June 

 14, S3 06. 



* Crepis scopulorum Coville, Contr. U. S. Nat. Herb. 3: 563. 



Differs from C. occidentalis in the numerous and narrow segments 



f In the original publication the name is spelled atrabarba, which is bad Latin. In 

 Latin the binding vowel is /, or occasionally, for euphony, o. 



