AND GENERA OF PLANTS. 419 
minal, subsessile; involucrum subglobose, densely and arachnoidly tomentose, 
the segments lanceolate, terminating in erect rigid spines, the inner series — 
merely acuminate; pappus conspicuously clavellate. 
Has. In Arctic America. (Hooker.) According to the specimen which he transmitted to the 
herbarium of the late Mr. Schweinitz, now in the Academy of Natural Sciences in Philadelphia, 
marked as ‘* Carduus discolor,” it appears to be also the C. discolor of the Flor. Bor. Am., Vol. L., 
p- 302. The specimen seems to be about sixteen inches high, - without a braneh, with one 
terminal flower, and three axillary buds: the involucrum would Slain be mistaken for that of C. 
lanceolatum ; the flowers are apparently pale purple: the stem leaves four to four and a half inches 
long, and less than three-quarters of an inch wide, excluding the spines, with a slender arachnoid 
deciduous pubescence above, and a white tomentum beneath; the radical leaves are more than a 
foot long, the lateral segments two to two and a half inches long, linear-sublanceolate, slenderly 
ciliate with minute spines. Florets unequally cleft, the segments narrow and glandularly thickened 
at the extremity, cauda of the anthers deeply lacerate. Pappus plumose, rather short, and bar- 
bellated. 
Circium Douglasit.. (Hoox.) Oss. This species, which I collected near Fort 
Vancouver, on the Oregon, is scarcely, if at all distinct from the C. undulatum. 
The flowers are unequally cleft, as usual, the segments linear and acute; cusps 
of the anthers linear and acuminate; the caudate process deeply lacerate in 
- several threads, the outer row of florets produce almost a simply barbellated, 
strong, rigid pappus, the inner florets a soft, plumose pappus, with slender cla- 
vellate tips. The capituli, when fully developed, are nearly naked and globu- 
lar. Flower pale purple. The leaves on both sides are white, more so be- 
neath, and very softly pubescent; they very much resemble those of the com- 
mon Artichoke. 
Circium * stenolepidum; stem branching, naked above, and, as well as the 
upper surface of the leaves, somewhat pilose and hirsute; flowers fastigiate, 
somewhat corymbose; leaves deeply pinnatifid, sublanceolate, beneath tomen- 
tose, segments deeply and almost equally bifid, spinosely ciliate and spinose at 
the points, somewhat decurrent and amplexicaule at base; capitulum nearly 
naked, slightly arachnoid, tomentose; divisions of the involucrum very long 
and linear, terminating in short, continuous, erect spines, the inner series much 
acuminated and unarmed. : 
Has. In the plains of Oregon. A tall and stout species, with the leaves somewhat resembling 
those of C. discolor. Capituli large and globular, somewhat clustered or corymbose, the branches 
fastigiate, sometimes producing two capituli. Flowers purplish, very remarkable for the narrow- 
ness and great length of the sepals, which are nearly an inch long, and less than half a line wide, 
