CREPIS OCCIDENTALIS AND TTS ALLIES. 
By FREDERICK V, COVILLE. 
While examining a recent collection of plants from eastern Wash- 
ington, Mr. John B. Leiberg came upon an undescribed Crepis, which 
is published below as Crepis barbigera. In order to render clear the 
relation of this plant to (C. occidentalis, 1 undertook to make a critical 
study of the latter, a work which is now completed, with the unex- 
pected result of bringing to light several apparently distinct species. 
The material used was obtained from the United States National 
Herbarium, and the herbaria of Harvard University, Columbia College, 
the Philadelphia Academy of Sciences, the California Academy of Sei- 
ences, the University of California, the Catholic U niversity of America, 
the New York College of Pharmacy, the Delaware Natural History 
Society, and the Missouri Botanical Garden, in which are contained all 
the existing type specimens, besides an excellent series of other material. 
The related species C. acuminata and C. intermedia are not consid- 
ered in the present paper, for, like some of the other species of the 
genus, they require further work for their proper understanding. 
ANALYTICAL KEY TO THE SPECIES. 
a. Bristly hairs, if present, glandular. 
b. Stem not conspicuously hirsute. 
c. Plant tomentose throughout; lobes of the leaves acute or acuminate. 
C. occidentalis. 
cc. Plant almost devoid of tomentum; lobes of the leaves obtuse or 
broadly acute. C. bakeri. 
bb. Stem conspicuously hirsnte. C. monticola. 
aa. Bristly hairs present and not glandular.' 
b. Plant rarely more than 30 cm. high; basal leaves not exceeding 20 em. in 
length. 
c, Achenia narrower at the apex, but without a distinct beak. 
d. Achenia brown and striate-costate at maturity. C. subacaulis, 
dd. Achenia usually olive-green and not costate at maturity. 
C. scopulorum. 
cc. Achenia tapering into a distinet beak. C. rostrata, 
bb. Plant more than 30cm. high; basal leaves more than 20cm. long. C. barbigera. 
1 Specimens of C. subacaulis occasionally have no bristly hairs. 
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