ee eS 
AND GENERA OF PLANTS. 
nial. Stems scapoid, dichotomous, corymbose. Leaves | 
tifid; stem leaves linear, entire.—In habit allied to Prenanthes. ae : Fae 
Crepis * acuminata; 21, stem smooth, above angular and paniculate; branches 
corymbose, naked, many-flowered; leaves runcinately pinnatifid, acuminate, 
pubescent; segments sublanceolate, sparingly laciniate, below attenuated into 
a petiole; upper stem leaves linear, entire; involucrum — involucel ap- 
pressed, pubescent. 
Has. Plains of the Platte. About a foot high. Root long, Blick, and heii Radical leaves 
about six inches long, with a lanceolate outline, one and a half to two inches wide in the middle, 
more or less pubescent on both surfaces. Flowers numerous and showy, bright yellow, with 
exserted five-toothed liguli. Style and stigma exserted and hirsute. Receptacle scrobiculate. 
Pappus copious, white and soft, a little barbellated. Central achenia longest, all "ten decrees 8 
rostrum short and thick. C. elegans approaches this species in the invol 
similar; but the achenium is furnished with a long slender rostrum, which pl ac 
enough, in the genus Barkhausia, — It has also all the habit, as well as great affinity. v th. 
tenuifolia of Siberia. — 
._- *PSILOCHENIA. 
Crepis, but with the achenium cylindric, curved, narrower above, and without 
she 
any visible striz, the testa indurated, and, when mature, black; an abortive 
outer series of florets, with the achenium empty. Pappus copious, slenderly 
pilose, scabrous, and yellowish white, about the length of the achenium. 
Receptacle naked, alveolate, the alveoles minutely fringed. A low perennial 
herb; stem dichotomous and corymbose. Leaves lanceolate, runcinately 
_ pinnatifid, and, as well as the somewhat hirsute involucrum, cinereously and 
closely lanuginous; flowers yellow, rather large. 
Psilochenia * occidentalis. Crepis occidentalis, Nortr. in Tourn. Acad. Nat. 
Sci. Philad., Vol. VIL., p. 29. 
- Has. On the plains of the Platte, tomate the Rocky Mountains. The whole plant more or less 
canescently pubescent. Stem about six or seven inches high, forked and corymbose at the summit. 
Leaves about an inch wide, four or five inchés long, déeply and runcinately pinnatifid, the segments 
- linear-laneeolate and denticulate, uppermost leaves vies Involucrum campanulate; sepals about 
twelve to fifteen in a single series, eget oe so — involucel or bractes four or five, 
‘small and subulate: there are blac] d with th dary pubescence of the <a Florets 
about twelve, yellow, exserted. , 
vil.—5 K 
