382 COMPOSITiE. 



6. A. Soiionieiisis, Greeue, Man. 180 (1894). Slender, decumbeut at 

 base, 1 — 1% ft. high, glabrous, only the leaf-margins scabrous-ciliolate: 

 radical leaves, narrowly lanceolate, very regularly, though remotely and 

 slightly serrate-toothed, tapering to a long petiole, this with a dilated 

 and strongly ciliate basal part: heads rather few in a terminal corymbose 

 panicle; involucres I4 in. high, broad-campanulate to broad-obconic, the 

 well imbricated bracts narrowly ublanceolate, acute ; rays purplish, 

 rather narrow, ^2 ^^- loug. — In open plains of the Sonoma Valley, in low 

 subsaline ground, Greene; also at Elk Grove, near the Sacramento 

 Eiver, Lreiv. Sept. 



7. A. (letiudatus, Nntt. Trans. Am. Phil. Soc. vii. 292 (1810). Erect, 

 1 ft. high or more, scarcely decumbent, glabrous, glaucous, only the 

 peduncles and sometimes the involucres pubescent: leaves chiefly radi- 

 cal, subcoriaceous, lanceolate or spatulate, entire, the margins strongly 

 ciholate-scabrous with short incurved hairs: inflorescemce a terminal 

 corymbose panicle : heads rather small ; involucral bracts regularly 

 imbricated, erect, the outer obtuse, with conspicuous green tips, the inner 

 aciate: rays light- blue: achenes nearly glabrous, substipitate. — Common 

 open meadow species of the Great Basin, reaching our borders in the 

 valley of the Truckee Eiver. Aug., Sept. 



8. A. froiideiis, Greene, Proc. Philad. Acad., 1895, p. 551. Stems 

 decumbent at the base, thence erect, often '2 ft. high, simple and spar- 

 ingly leafy with large leaves up to the summit, which bears one or more 

 very large hemispherical heads on short peduncles; herbage green and 

 nearly glabrous: radical leaves obovate-oblong, petiolate, 4 or 5 in. long, 

 the lower cauline nearly as long but spatulate and sessile; the uppermost 

 auriculate-clasping: heads ^2 ^^- high and very broad: bracts of invo- 

 lucre nearly equal, the outer broader and more foliaceous, but even the 

 spatulate inner ones mainly herbaceous: rays many, % in. long, pur- 

 plish. — Mountains of Plumas Co.; diifering from the Rocky Mountain 

 type of the species in having a thinner foliage. 



9. A. Oregaiius, Nutt. in T. & G. Fl. ii. 163 (1841); Trans. Am. Phil. 

 Soc. vii. 296 (1840), under Tripolhim. Often 3 ft. high or more, erect, 

 leafy, contractedly or amply paniculate; herbage merely somewhat sca- 

 brous, the mostly narrowly lanceolate leaves from 3 or 4 in. long on the 

 main stem to 1 or 2 in. long on the branches, all sessile and slightly 

 auriculate clasping, those of the branchlets mucronate : heads hemi- 

 spherical, 4 or 5 lines high; bracts in 2 or 3 series, all with short linear 

 coriaceous base and ample spreading broader herbaceous tips : rays 

 many, flesh-color to purplish. — Frequent on moist stream banks east of 

 the Sierra, and along the Washoe foothills east of Truckee, thence 

 to Plumas and Modoc counties and northward. Sept. 



