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, glauces- 

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

 entire to laciniate-pinnatifid : 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-oblong to oblong-lanceolate, from repand to run- 

 cinate-pinnatifid with short lobes or teeth ; cauline none, or small and narrow 

 at the forks : involucre i 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. 



+- ■*- 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-pinnatifid. 

 ** Principal bracts Of the involucre and flowers 5 to 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 J 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 cinereous-puberulent, usually with fewer heads: involucre \ inch or 

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

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

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

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

 Sierra Nevada, California, and north to Washington. 



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- 

 dental's, var. gracilis, Eaton. 



++ ++ 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 : invojucre J to § inch high, canescent : 

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



