14. RypBerc: 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 I cm. 
long; calyculate bracts ovate or ovate-lanceolate, only I-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 Seselt. 
IpAHo: 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.). 
HIERACIUM 
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. wmbellatum is exceedingly rare 
in America and confined to the extreme northeastern part, evi- 
dently an introduced plant. H. columbianum on account of its 
* Muhlenbergia 1: 142. 1906, 
