390 COMPOSITE. Chamactis. 



Southeastern Nevada, Miss Searls ; may be looked for on the Colorado : added to complete the 

 account of the genus. 



6. C. Stevioid.es, Hook. & Arn. Corymbosely branched, a span or more high : 

 leaves once or somewhat twice pinnately parted into narrow linear lobes, the upper 

 mostly entire : scales of the pappus lanceolate or narrowly oblong, acute, not much 

 shorter than the akene. 



Sand-hills on the Colorado, near the Mohave, &c., and through Nevada north to Pyramid Lake 

 and east to Utah and New Mexico. Heads rather small, on peduncles from half an inch to an 

 inch and a half in length. 



-i- +- The marginal corollas little or not at all enlarged, regular or nearly so. 



++ /Scales of the involucre tapering into a filiform or setaceous-subulate tip : pappus of 

 4 equal scales : pubescence minute and glandular, no woolliness. 



7. C. carphoclinia, Gray. Corymbosely branched, slender, rigid, a span high : 

 leaves once or twice pinnately parted into nearly filiform lobes : involucre campanu- 

 late ; its scales with rather abrupt and short setaceous or subulate tips (sometimes 

 sparsely hispid as well as glandular-viscid) : receptacle furnished with 5 to 10 slen- 

 der and rigid persistent awns subtending flowers and almost equalling them in 

 length : scales of the pappus ovate-lanceolate, acuminate, nearly as long as the akene, 

 more than half the length of the corolla, or in a few of the outermost flowers short 

 and truncate. Bot. Mex. Bound. 94. 



Southeastern borders of the State ; at Fort Yuma (Thomas) ; on the Gila and Colorado Desert 

 (Schott, A. B. Gray) to S. Utah, Parry. Also Northwestern Nevada near the borders of Cali- 

 fornia, Lemmon. Remarkable for the palcce (rather than firnbrillce) of the receptacle in the form 

 of awns, subtending some or most of the disk-flowers. 



8. C. attenuata, Gray. Resembles the preceding ; but leaves apparently less 

 divided and more filiform : heads smaller (5 lines long), much narrower and fewer- 

 flowered : scales of the involucre narrow and more concave or involute : receptacle 

 naked, as in the genus generally : scales of the pappus broadly obovate-cuneate and 

 truncate, many times shorter than the corolla or the akene, little exceeding the 

 hirsute hairs of the latter. Proc. Am. Acad. x. 73. 



Ehrenberg, Arizona, A. E. Janvier, from W. M. Canby ; possibly on the borders of California 

 also : added to complete the genus. 



++ ++ Scales of the involucre obtuse and pointless : pappus double, i. e. of 4 long and 4 

 very short and differently-shaped scales : leaves once or somewhat twice pinnatifid or 

 the uppermost entire : woolliness thin and soon deciduous. 



9. C. Xantiana, Gray. A span to a foot or more high, rather stout ; the stem 

 or branches terminated by a solitary large head on a thickish peduncle : leaves 

 pinnately parted into 3 to 7 narrowly linear and distant lobes, the terminal one 

 elongated : scales of the involucre narrowly linear, rather loose : anthers at length 

 mainly exserted : pappus of 4 lanceolate scales almost equalling the corolla, and 

 4 exterior ones which are obovate or obcordate and several times shorter. Proc. 

 Am. Acad. v. 545. 



Var. integrifolia, Gray, 1. c. A slender simple-stemmed form, with most of the 

 narrow linear elongated leaves entire, rarely a lobe or two, and the head narrower 

 and fewer-flowered. 



Near Fort Tejon, Xantus. Owens Valley, Dr. Horn (the variety). Western borders of 

 Nevada, Anderson, Lemmon. Head an inch or less high, on a mostly fistulous peduncle of an 

 inch or two in length ; one or two of the uppermost simple leaves passing into involucral bracts. 

 Corollas a quarter of an inch long ; the short lobes of those of the disk sparsely bearded exter- 

 nally ; those of the margin twice or thrice as large. Akenes fully 3 lines long. 



1 0. C. macrantha, D. C. Eaton. A span high : leaves pinnately or somewhat 

 twice pinnately parted into broadly linear or oblong lobes : scales of the involucre 

 linear : anthers included : pappus of 4 linear-oblong scales about half the length of 



