14 Rydberg : Studies on the Rocky Mountain flora 



I think has been redescribed under the name C. exilis Osterhout,* 

 omitted by Nelson. 



Crepis pumila Rydb. is made a synonym of C. occidentalis. 

 C. pumila is not only a lower plant, without any trace of black 

 glandular hairs, but it has different, perfectly columnar achenes. 

 Apparently it was included by Dr. Gray in his C. occidentalis 

 costata. 



Crepis atribarba Heller is made a synonym of C. barbigera 

 Leiberg. The two are not even closely related. The latter is 

 not found within the region, and there was no need of even con- 

 sidering it. 



Crepis seselifolia sp. nov. 



Perennial with an ascending rootstock and short base covered 

 by remains of old leaves; stem 4-6 dm. high, slender, canescent- 

 tomentulose or the upper part glabrous ; basal leaves long-petioled ; 

 blades 1-2 cm. long, deeply twice pinnatifid, with linear filiform 

 divisions, canescent-tomentulose, caudate-acuminate, with an 

 elongated linear entire end 5-8 cm. long; stem-leaves subsessile, 

 less divided or the uppermost entire and linear-filiform; heads 

 corymbose-paniculate; involucre glabrous, cylindric, about 1 cm. 

 long; calyculate bracts ovate or ovate-lanceolate, only 1-1.5 mm. 

 long; bracts proper 5-7, linear, yellowish green; flowers 5-7; 

 ligules nearly 1 cm. long; achenes somewhat fusiform, striate. 



In habit this species resembles most Crepis gracilis (D. C. 

 Eaton) Rydb., but the divisions of the leaves are much narrower 

 and often again divided into very narrow divisions, and the 

 involucre is glabrous as in C. acuminata. The leaves resemble 

 those of certain species of the genus Seseli. 



Idaho: Rocky hillsides, scarce, valley of Big Potlatch River, 

 Nez Perces County, Idaho, June 6, 1892, Sandberg, MacDougal 

 & Heller 326 (type, in herb. N. Y. Bot. Gard.). 



HlERACIUM 



Professor Nelson includes both Hieracium umbellatum L. and 

 H. canadense Michx. in the flora of the Rocky Mountains. Nei- 

 ther is found in the region. H. umbellatum is exceedingly rare 

 in America and confined to the extreme northeastern part, evi- 

 dently an introduced plant. H. columbianum on account of its 



* Muhlenbergia i: 142. 1906. 



