COMPOSITE. (COMPOSITE FAMILY.) 219 



its bracts narrow, acute, little thickened below after flowering: pappus not 

 remarkably copious: leaves mostly radical. 



3. C glauca, Torr. & Gray. Usually scapose, 1 to 2 feet high, glances- 

 cent or glaucous : radical leaves from obovate-spatulate to lanceolate, from 

 entire to laciniate-pinnatijid : involucre 4 lines high, glabrous or nearly so, as 

 also the peduncles : akenes oblong, with slightly narrowed summit, strongly 

 and evenly 10-ribbed. Fl. ii. 438. Moist ground, from the Saskatchewan 

 and Nebraska to Utah and Nevada. 



4. C. runcinata, Torr. & Gray. Not, glaucous or slightly so, 1 to 2 feet 

 high: radical leaves obovate-obloug to oblong-lanceolate, from repand to run- 

 cinatR-pinnatiJid with short lobes or teeth ; cauline none, or small and narrow 

 at the forks : involucre - inch high or smaller, pubescent, often hirsute, some- 

 times (with peduncles and upper part of scape) glandular-hispidulous : akenes 

 narrowly oblong, moderately narrowed upward, somewhat evenly 10-ribbed. 

 Loc. cit. In subalpine swamps, from Colorado and Utah to Montana and the 

 Saskatchewan. 



t- -i- Cinereous-pubescent, at least the foliage : bracts of the involucre at length 

 with more or less thickened or keeled midrib, at least at base : leaves usually 

 laciniate-pinnatijid. 



w. Principal bracts of the involucre and flowers 5 t o 8 : no hirsute pubescence: 

 pappus moderately copious and soft. 



5. C. acuminata, Nutt. Minutely cinereous below, but green : stem 

 slender, 1 to 3 feet high, 1 to 3-leaved, bearing a fastigiate or corymbiform 

 cyme of numerous small heads : leaves elongated, slender-petioled, oblong- 

 lanceolate in outline, laciniate-pinnatifid, tapering to both ends, the apex 

 usually into a lanceolate or linear tail-like prolongation : involucre i to ^ inch 

 long, rarely over 6-flowered, smooth and glabrous: akenes at maturity fusi- 

 form, considerably longer than the pappus, lightly striate-costate, moderately 

 attenuate at summit. Dry ground, Montana and Wyoming to E. Oregon, 

 Utah, and California. 



6. C. intermedia, Gray. Habit and foliage of the preceding, or less 

 tall, more ciuereous-puberulent, usually with fewer heads: involucre \ inch or 

 more long, cancscentltj puberulent ; its bracts in age more carinate by thick- 

 ened midrib: akenes acutely 10 costate at maturity, oblong-fusiform, slightly 

 attenuate upward, longer than or equalling the pappus. Synopt. Fl. i. 432. 

 C. acuminata, Gray, Bot. Calif., partly. Rocky Mountains in Colorado to the 

 Sierra Nevada, California, and north to Washington Territory. 



Var. gracilis, Gray. A very slender form, with rhachis and apical pro- 

 longation as well as lobes of the leaves attenuate-linear. Loc. cit. C. occi- 

 dentalis, var. gracilis, Eaton. 



w .M. Principal bracts of involucre 9 to 24 and flowers 10 to 30 : pappus exceed- 

 ingly copious and harsher. 



7. C. OCCidentalis, Nutt. Often hirsute as well as canescent, rather 

 robust, a span to a foot or so high, commonly leafy-stemmed and branching : 

 leaves oblong-lanceolate or broader in outline, variously laciniate-pinnatifid or 

 incised, apex seldom much prolonged : involucre ^ to inch high, canescent : 

 akenes longer than the pappus, usually with tapering summit and acute ribs. 



