340 COMPOSITE. Chcenactis. 



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



Coll. iu Idaho, 1876, Nevius. 



* * Corollas white or pale flesh-colored. 



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

 mately ligulate : bracts of the involucre linear, obtuse or acutish: pappus of 4 paleoe: winter 

 annuals. 



C. Fremonti, GRAY, 1. c. Glabrate, the slight woolliness caducous, or glabrous, except 

 the puberulent 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 half or two-thirds 

 inch high, terminating rather 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 cuueate almost equally 4-5-cieft ligule (of 3 lines in 

 length) : palea? of the 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, L< i/u/ion, &c. Partly confounded in Cot. Calif, with the next. 



C. stevioides, HOOK. & ARX. Floccose-tomeutose, glabrate in age, seldom a foot high, 

 freely and loosely branched, bearing numerous somewhat cymosely disposed heads (of half- 

 inch in height) on short slender peduncles : leaves 1-2-pinnately parted into short linear lobes, 

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

 marginal corollas with moderately ampliate unequally 5-lobed limbj not surpassing the disk : 

 palese 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 To! title. 



C. brachypappa, GRAY. Resembles the preceding : leaves perhaps thicker : heads broader : 

 involucral bracts with prominent midrib: paleae of pappus alike in inner and outermost 

 flowers, quadrate or slightly cuueate, very truncate, not longer than the short proper corolla- 

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

 389. S. E. Nevada, in the Pahrauagat Mountains, Miss Scarls. 



-1 -) Marginal corollas little enlarged, nearly regular: receptacle commonly with a few fimbriilae 

 or bracts in the form of setiform awns : bracts of the receptacle very narrowly linear, cuspidately 

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



WOollilH'S.S. 



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-piu- 

 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, and 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 Gen. Thomas. 

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



at all enlarged : hardly any fimbriilae on the receptacle : palere 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 Canlxj. 



H -i 4 Marginal corollas not larger than the others (or only slightly so in C. Xuntiann). 

 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 paleaj little shorter than the 

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



