Chasnactis. COMPOSITE. 389 



-i- Pappus of 4 or sometimes 5 about equal mostly oblong-lanceolate acutish scales, or 

 in the marginal flowers irregular and unequal as well as shorter. 



1. C. lanosa, DC. Whitish with floccose but deciduous wool, the older leaves 

 becoming glabrous, a span or more high, branched and leafy only at the base : the 

 simple naked peduncles therefore long and scape-like, bearing solitary heads : leaves 

 with few narrowly linear divisions, or the uppermost entire : enlarged marginal 

 corollas with short ovate lobes, hardly surpassing those of the disk. 



Sandy hills, from Monterey to near San Diego. Heads barely half an inch high, on peduncles 



3 to 6 inches long. 



2. C. glabriuscula, DC. Lightly floccose-woolly, at length somewhat glabrous, 

 branching throughout, a foot or so high : leaves with several rather short thickish 

 obtuse linear divisions : heads on stout rather long peduncles : scales of the involu- 

 cre rather broadly linear and obtuse : marginal corollas with conspicuously enlarged 

 and radiating palmate limb, the lobes oval or oblong. Var. megacephala, Gray in 

 Pacif. R. Rep. iv. 104, is merely a stouter form, with mostly larger heads and 

 flowers ; so is C. demtdata, Nutt. PL Gamb. 177. 



Open grounds, from the Upper Sacramento, and along the foot-hills of the Sierra to Los 

 Angeles. Rather stout. Heads from half to three fourths of an inch high, inclined to be corym- 

 bose, on pedunc'es from 2 to 7 inches long. 



3. C. tenuifolia, Xutt. Slightly and delicately woolly when young, becoming 

 nearly glabrous, a span to a foot or more high, leafy and branching to the top : 

 leaves once or somewhat twice pinnately parted into very narrow or filiform lobes : 

 heads somewhat corymbose, on short peduncles : scales of the hemispherical involucre 

 narrowly linear and very numerous : enlarged marginal corollas with short some- 

 what irregular lobes and not surpassing those of the disk. C. fllifolia, Gray, PI. 

 Fendl. 98. 



Vicinity of San Diego. Heads barely 4 or 5 lines high, broad in proportion, on peduncles of 

 an inch or less in length. Involucre rather short. Akenes much shorter than in the preceding 

 species. The C. filifolia, described from a single specimen belonging to the Dublin University 

 herbarium, is probably a form of this rather than of the preceding species. 



+- -t- Pappus, at least of the disk-flowers, double, of 4 ordinary and of 1 to 4 very 

 much smaller alternating scales. 



4. C. heterocarpha, Gray. A span to nearly a foot high, lightly and loosely 

 woolly when young, simple or branching above, leafy : leaves pinnately parted into 



4 to 9 narrowly linear unequal divisions : scales of the involucre broadly linear : 

 enlarged marginal corollas with oblong lobes mostly surpassing the disk. PI. 

 Fendl. 98. 



Var. tanacetifolia, Gray. Dwarf, with bipinnately parted leaves mostly tufted 

 at the base ; their lobes numerous, very short, crowded, often oblong or oval : root 

 biennial. C. tanacetifolia, Gray, Proc. Am. Acad. vi. 545. 



On the Sacramento and its tributaries, Ukiah, &c., Fremont, Hartweg, Bolander. The vari- 

 ety, Lake Co., near Clear Lake, Bolander. Heads about half an inch high ; the peduncle an 

 inch or two long. Pappus of the outermost flowers sometimes as in the inner, or irregular and 

 shorter, sometimes much shorter and the small outer scales wanting. 



* * Corollas white or flesh-colored, 



+- The marginal ones obviously enlarged and somewhat obliquely 5-lobed, but not 

 surpassing the disk : pappus of only 4 or sometimes 5 usually equal scales : scales 

 of the involucre numerous and narrow-linear. Herbage with minute woolliness 

 which early disappears, then glabrous, minutely granular or glandular above. 



5. C. brachypappa, Gray. Corymbosely branched, a foot high : leaves twice 

 pinnately parted into short-linear and rather rigid divaricate lobes : peduncles short : 

 scales of the pappus truncate and almost square or slightly cuneate, one fourth of 

 the length of the akene. Proc. Am. Acad. viii. 390. 



