CATALOGUE, 
195 
heads large, glomerate in tlie axils of the uppermost leayes," or peduncled; 
involucral scales linear-laneeolate, appressed, spine-tipped, arachnoid-tomen- 
tose ; mys purplish. — This is not nearly so white a plant as C. undulatum ; 
the leaves are much narrower and more prickly, and the involucre more arach- 
noid. The present specimens have naked long-peduncled heads, and in this 
respect differ from the type as originally characterized. Mountains of British 
Columbia to Oregon and Idaho. Colorado, (Parry 34, Hall & Harbour 340, 
and 341, white-flowered.) From the West to the East Humboldt Mountains, 
Nevada ; 5,500-7,000 feet elevation ; June, July. (G88.) 
CiESiUM CouLTERi, Harvey & Gray. Fl. Fendl. 110. Webby-tomen- 
tose ; stem branching ; stem-leaves oblong-lanceolate, partly clasping, loosely 
webby above, the edges wavy or sinuate ; heads very large, solitary, not 
bracted at the base; involucre exceedingly arachnoid-woolly, the scales loosely 
imbricated, straight, at length spreading, all of them oblong or lanceolate from 
a short base, gradually narrowed into a long cuspidate needle-like point. — 
Heads nearly 2' broad ; flow^ers deep crimson ; leaves much hke those of C\ 
undulatum^ but not so deeply lobed. California, (Coulter, Brewer ! Bridges, 
268 !) Carson City, Nevada, (Anderson !) 
CmsiUM Drummondii, T. & Gr. Stemless, or with simple stems 1-2'^ 
high, glabrous or very sparingly and deciduously webby ; leaves green and 
smooth above, paler and sometimes shghtly webby beneath; radical ones 
oblanceolate or spatulate, the primary ones entire with ciHate-spinulose mar- 
gins, later ones and the stem-leaves pinnately toothed or incised, often doul)ly 
so, and spiny with weak slender prickles ; heads 1-4, sessile or short-stalked, 
surrounded either by the radical leaves or by a circle of leaves at the top of 
the stem; involucres glabrous, the scales triangular-lanceolate, apf>ressed, 
tipped wdth weak prickles ; flowers "red" or purplish. — There are two forms, 
differing only in the presence or lack of a stem, and even in this respect they 
pass into each other, {a.) The caulescent form. Saskatchewan and Kocky 
Mountains of British America ; Colorado, (Hall & Harbour, 343.) Hum- 
boldt Valley, meadows in the Toyabe Mountains, and in Bear River Canon ; 
5-8,000 feet elevation. (689.) (/?.) The acaulescent form ; {C. acaule.Yiix. 
Americanum, Gray. Proc. Acad. Phil, March, 1863, p. 68.) Colorado 
(Hall & Harbour, 339 ! Vasey, 349 !) to Cahfornia (Brewer !) and Oregon 
(Kronkhite !) Carson City, Nevada, (Anderson, 91 !) Ruby and Thousand 
