390 COMPOSITE. ChoenacUs. 



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

 account of the genus. 



6. C. Stevioides, Hook. & Arn. Corymbosely branched, a span or more liigh : 

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

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

 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. 



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



-s--!- /Scales of the involucre tapering into a filiform or setaceous-siibulate tiji : 2)a2)2^us of 

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



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

 leaves once or twice pinnately parted into nearly filiform lobes : invoktcre 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. Boimd. 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 jmlcai (rather than fimbrillce) of tlie receptacle in the form 

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



8. C. attenuata, Gray. Eesembles 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 

 hirsitte hairs of the latter, — Proc. Am. Acad. x. 73. 



Ehrenberg, Arizona, A. E. Janvier, fi-om JV. M. Canby ; possibly on the borders of California 

 also : added to complete the genus. 



+-5- ++ Scales of the involucre obtuse and pointless : pappus double, i. e. of 4 lotig and 4 

 very short and differently-shaped scales : leaves once or somewhat twice j^innatifid or 

 the up2^ermost entire : ivoolliness 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. r)l.'i. 



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-floAvered. 



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. 



10. 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 



