COMPOSIT.E. (COMPOSITE FAJVIILY.) 2rj 



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



remarhabhi copious: leaves mostli/ radical. 



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

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

 entire to laciniate-pinnatijid : involucre 4 lines h\gh, glabrous or nearli/so,as 

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

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

 and Nebraska to Utah and Nevada. 



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

 high: radical leaves obovate-oblong to oblong-lanceolate, //om r^'yiriHr/ /o nin- 

 cinate-piunatijid 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 (ivith peduncles and upper part of scape) glandular-hisjudulous: akenes 

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

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

 Saskatchewan. 



- H- 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 usualli/ 

 laciniate-pinnatijid. 

 *+ Principal bracts of the involucre andfowers 5 to 8: no hirsute pubescence: 

 pappus moderatelij copious and soft. 



5. C. acuminata, Nutt. ^linutely 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 | to ^ inch 

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

 form, considerably longer than the pappus, lightlg 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, usualhj with fewer heads: involucre h inch or 

 more long, canescentlj puberulent ; its bracts in age more carinate b// thick- 

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

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

 C. acuuiinata, Gray, Bot. Calif., partly. Kocky Mountains in Colorado to tho 

 Sierra Nevada, California, and north to Washington. 



Var. gracilis, Gray. A very slender form, with rhachis and aj)ical pro- 

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

 (If-ntalis, var. gracilis, Eaton. 



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

 ingli/ copious and harsher. 



7. C. oecidentalis, Nutt. Often hirsute as well as canoscont. nthor 

 robust, a span to a foot or so high, commonly Icafy-steniinod and branching: 

 leaves oblong-lanceolate or broader in outline, variously laciniato-j)innatifid or 

 incised, apex seldom much prolon<;ed : involucre ^ to 5 inch high, c:inescent: 

 akenes longer than the pappus, usually with tapering summit and u.uto riba. 



