340 COMPOSITiE. aicenactis. 



form vestiges : otherwise resembles the preceding, so far as an insufficient specimen shows. 



— Coll. in Idaho, 187G, Nevius. 



* * Corollas white or pale flesh-colored. 



-t— Marginal ones with throat and limb manifestly enlarged, and unequally 5-lobed or even pal- 

 matelv ligulate: bracts of the involucre linear, obtuse or acutish: pa[)pus of 4 paleoe: winter 

 annuals. 



C. Premonti, Gray, 1. c. Glabrate, the slight woolliness caducous, or glabrous, except 

 tlie pubcrulent or hispidulous peduncles, a foot or less high, rather stout : leaves thickish, 

 narrowly linear, many entire, some with 2 to 5 similar linear lobes : heads halt' or two-thirds 

 inch high, terminating ratlier simple erect branches: bracts of the involucre thickish, rather 

 acute, with prominent midrib : marginal corollas comparatively large and conspicuous, ligu- 

 lately palmate, not rarely developing a cuueatc almost equally 4-5-cleft ligule (of 3 lines in 

 length) : paleje of tlie pappus linear-lanceolate, nearly equalling disk-corolla, with manifestly 

 thickened axis at base forming a vanishing costa. — Desert of the Mohave and Lower Colo- 

 rado, California, and adjacent Nevada and Arizona, Fremont (imperfect specimen), Newberry, 

 Parish, Lcmmon, &c. Partly confounded in Eot. Calif, with the next. 



C. stevioides, Hook. & Arn: Floccose-tomentose, glabrate in age, seldom a foot high, 

 freely and loo.sely branched, bearing numerous somewhat cymosely disposed heads (of half- 

 incii in hciglit) on short slender peduncles : leaves 1-2-piunateIy parted into short linear lobes, 

 uppermost rarely entire : bracts of involucre narrowly linear, obtuse, with obscure midrib : 

 marginal corollas with moderately ampliate nne(jually 5-lobed limb, not surpassing the disk : 

 paleai of the pappus scarcely thickened at base, those of the inner flowers oblong-lanceolate 

 and shorter than the corolla, of the outer ones ovate or oblong, often unequal, sometimes 

 much shorter. — Bot. Beech. 353; Torr. & Gray, Fl. ii. 371 ; Eaton in Bot. King Exp. 172. 



— Dry interior region, Utah and S. Idaho, to eastern side of Sierra Nevada and through 

 Arizona; first coll. by Tolmic. 



C. bracliypappa, Gray. Resembles the preceding : leaves perhaps thicker : heads broader : 

 involucral bracts witli prominent midrib: paleiB of pappus alike in inner and outermost 

 flowers, quadrate or sliglitly cuneate, very truncate, not longer than the short proper corolla- 

 tube, barely one fourtli the length of the akene. — Proc. Am. Acad. viii. 390, & Bot. Calif, i. 

 389. — S. E. Nevada, in the Pahranagat Mountains, 3fiss Searls. 



4— ^_- Marginal corollas little enlarged, nearly regular: receptacle commonly witli a few fimbriik-e 

 or bracts in the form of sctiform awns : bracts of the receptacle very narrowly linear, cusjiidately 

 or setaceously acuminate: pappus of 4 paleaj: winter annuals, minutely puberulent, with no 

 woolliness. 

 C. carphoclinia, Gray. A foot or less high, diffusely much branched, slender, bearing 

 numerous scattered heads (barely half-inch high) on short filiform peduncles : leaves 1-2-pin- 

 nately parted into almost filiform lobes : involucre 30-40-flowered : awns on the receptacle 

 5 to 10 among and nearly equalling the flowers, rigid, persistent : palea; of the pappus ovate- 

 lanceolate, acute or acuminate, aiul little or moderately shorter than the inner corollas, or in 

 the outer much shorter, occasionally very short. — Bot. Mex. Bound. 94, & Bot. Calif. I.e. 



— Arid districts, W. Arizona and S. Utah to S. E. California; first coll. by Geji. Tliomns. 

 C. attenuata, Gray. More slender, with narrow 15-20-flowered heads : ray-corollas hardly 



at all enlarged : hardly any fimbrillfe on the receptacle : paleoe of the pappus very short, 

 broadly obovate-cuneate and truncate: otherwise nearly like the preceding. — Proc. Am. 

 Acad. X. 73, & Bot. Calif. 1. c. — Ehrenberg, Arizona, Janvier, through Canhij. 



H— ^— -1— Marginal corollas not larger than the others (or onh* slightly so in C. Ximtiann). 

 receptacle quite naked: involucral bracts pointless, narrowly linear, rather loose, the midrib 

 obvious: pappus of 4 conspicuous pale« and usually 2 to 4 small alternating outer ones: leaves 

 simply pinnately parted, with divisions entire or merely 1-2-toothed: winter annuals. 



C. Xantiana, Gray. Stout, often a foot or more high, tomentulose when young, some 

 glabrate : ascending simple branches terminated by large (three-fourths to inch long) solitary 

 many-flowered heads on thick often fistulous peduncles : leaves with a few narrowly linear 

 distant lobes, or some entire : corollas with short oval or oblong lobes a little bearded ex- 

 ternally, or in the margin rather broader and more spreading, but equal : anthers partly 

 exserted (in the manner of the genus) : pappus of 4 lanceolate pale*, little shorter than the 

 corolla, and of as many very short obovate or obcordate ones. — Proc. Am. Acad. vi. 545, 



