COMPOSITE. (COMPOSITE FAMIIA.) 21 'i 



more or less herbaceous spinescent-tipped spreadintj upper portion, and no 

 glandular dorsal ridye. 



4. C. Eatoni, Gray. A foot or so hitjh, mostly simpio, loosehi arachnoid- 

 woollj or glabrale : leaves piuuatifid or pinnately j)artt'(l into short lubes, 

 mostlij very pricklij, eitiier green and glabrate, or remaining whitish-woolly 

 beneath: heads an inch high, few or several and sessile in a terminal rlnsttr : 

 involucre from arachnoid-ciliate to glabrate or ai)j)arently glabrous ; its principal 

 bracts erect, with broadish appressed base, abruptly attenuate into tiie sul)U- 

 late-acerose sliglitly herbaceous spinesceut portion, outermost little shorter 

 thau the inner: corolla whitish. — Proc. Am. Acad. xi.\. .50. (J ir slum folio- 

 sum and C. Drummondii in part, of the Western Reports. Mountains of Colo- 

 rado, l^tah, and Nevada. 



5. C. Neo-MexicanuS, Gray. Stout, 2 to A fitt hujh; hcrhagp. and 

 commonli) squarrose involucre copiouslg ichite-woolli/ : leaves from sinuate- 

 dentate to pinnatifid, not very prickly: heads solitary, terminating the stem 

 or branches, often 2 inches high and broad : principal bracts of the involucre 

 with spinescent rigid tips ^ to I inch long: corolla from white to pale-pur- 

 ple. — Proc. Am. Acad. x. 45. Plains of S. Colorado, New Mexico, and 

 Arizona. 



* * * * Bracts of the involucre regularly and chiefly appressed-imbricated in 

 numerous ranks ; the outer successively shorter, not herbaceous-tipped or 

 appendaged. 



-t- Flowers from rose-purple to white: involucre glabrous or early glabrate, the 

 light arachnoid wool caducous ; its bracts coriaceous, not at all glandular on 

 the back, outer tipped icilh a short weak prickle or cusp, innermost wholly 

 unarmed. 



6. C. Drummondii, Gray. Green and someichat villous-pulxsifnt, or 

 when young lightly arachnoid-woolly, either stemless and bearing se.s.s//^' hfads 

 in a cluster on the crown, or caulescent and even 2 or 3 feet high, icith solitary 

 or several loosely disposed heads : leaves from sinuate or almost entire to pinnately 

 parted, moderately prickly : larger heads fully 2 inches high : involucral bract.s 

 weak-prickly pointed, innermost with more scarious and sometimes obviou.^^ly 

 dilated and erose-fimbriate tips : corollas either white or sometimes rose- 

 purple. — Proc. Am. Acad. x. 40. From the mountains of Colorado and 

 California to the far north. 



Var. aeaulescens, Gray. Smaller, witli heads (solitary or several on 

 the crown, encircled by the radical leaves) only inch and a half long, or lean, 

 and proportionally narrow : outer involucral bracts with a longer but rather 

 weak prickle. — Mountains of Colorado to California. 



7. C. SCariosus, Gray. White with cottony tomcntum, at least the lower 

 face of the leaves: stem about a foot high : leaves of lanceolate outline, mostly 

 pinnately parted into lanceolate long-prickly lobes ; upper face sometimes villous, 

 sometimes only cottony and early glabrate : heads 2 or 3 in a sessile cluster, 

 or solitary on short leafy branches : innermost bracts of involucre ct)mmonly 

 with more conspicuous ero.se or entire scarious tips : corolhis pale or white. — 

 Synopt;. n. i. 402. Mountain plains, Wyoming and Utah. 



