ASWR COMPOSiTJS S0& 



dilated and obtuse green tips, appressed, the outer sucdeSsiVely shorter.: 

 rays about 20, purple or violet, nearly half-inch long : achenes compressed 

 minutely pubescent . In Southern Oregon to California. 



A. Hallii Gray Proo. Am. Acad, viii, 388. Stems slender, strict, 1-2 

 feet high, leafy to the top, bearing numerous, short racem )usely disposed 

 flowering branches, these minutely pubescent ; leaves, 1-2 inches long by 

 1-2 lines broad, entire, sea brous-ciliate, , otherwise smooth and glabrous, 

 neither dilated nor contracted at base: heads numerous, 3-4 lines high, 

 somewhat racemosely paniculate and crowded: involucre campanulate., 

 glabrous; the brads subepatulate-linear, with oval or oblong green tips, 

 rather close and erect. : rays white or whitish, 2-3 lines long. Along ditches 

 and embanlsments, Willamette Valley, Oregon. 



A. Fremontl Gray Syn.El. 1, Pt. 2, 191. Stems f lender, erect,l-2feet 

 highjglabrous or the upper parts soft-pubescent: leaves thinnish, the mar- 

 gins either quite naked and smooth or obscurely ciliolate scabrous, radi- 

 cal and lowest cauline oblong or oblanceolate, or somewhat obovate, i--3 

 inches long, tapering into a slender margined petiole ; cauline from ob- 

 long lanceolate to linear, commonly half-clasping at base : heads solitary 

 in tbe smaller specimens, several in the larger, 4-6 lines high, somenhat 

 naked-peduDcled: bracts of the involucre narrowly linear, obtuse or acut- 

 ish, or the inner acute, some of the outer shorter, all loose and similiar: 

 ravs numerous) 4-6 lines long. In wet mountain meadows. Cascade moun- 

 tains near Mt. Hood to the Bocky mountains. 



A. occidentalis. Nutt. T. & G. Fl. ii, 164. Smooth and glabrous, or 

 minutely pubescent below the heads, slender, 1—2 feet high; small plants 

 simple, bearing several to numerous corymbose or paniculate heads: 

 leaves mainly linear and narrow; cauline 1-3 inches long by 1-3 lines 

 hroid, rarely lanceolate and larger ; radical, sometimes lanceolate-spatu- 

 late, with long tapering base : heads 4- 6 lines high : inyolucral bracts nar- 

 rowly- or Bubulate-linear acute or acutish, thinnish, loose, obviously im- 

 bricated of two or three lengths : rays light violet,4T5 lines long. In moist 

 meadows in Eastern Oregon and Washington to the Rocky mountains. 



Var. intermedins Gray Syn. Fl. i, Pt. 2, 192. Stems slender, 1-2 

 feet high rather rigid; somewhat sparingly leafy, with paniculate flower- 

 ing.branches: radical and sometimes cauline leaves lanceolate: short outer 

 bracts of the involucre often jjuite obtuse. On edge of wet mountain 

 meadows of Washington to California. 



A Oreganns Nutt. T. & G. Fl. ii, 164. Nearly glabrous : stem, rather 

 slender, 2 feet high, paniculate branched at summit or bearing several to 

 mauy, paniculate heads : leaves linear-lanceolate, entire : heads about 3 

 lines high; bracts of the involucre loose, the outer ones herbaceous, lanceo- 

 late, acute, not longer than the thin and narrow iiiner ones: rays about 

 2 lines long white or purplish. On wet banks of streams, Oregon and 

 Washington to Idaho. 



A. Uongrlasil Lindl. DC. Prodr. v, 239. Glabrous or nearly so: 

 stems 2-6 ftet high with erect or ascending branches, bearing several or 

 numerous paniculate heads : leaves, lanceolate, 2-6 inches long, tapering to 

 both ends, more or less petioled, commonly serrate along the middle by 

 acute and appressed or erect teeth : heads numerous, 5-6 lines high : bracts 

 of the involucre linear, acute, loosely imbricated, the small green tips 

 commonly spreading outer foliaceous ones few and not dilated, often want- 

 ing : rays 20-30, violet to purple, 6-8 lines long: achenes smooth. Com- 

 mon along streams and river bottoms of Northern California to British 

 Columbia. 



A. foliacens Lindl. DC. Prodr . v, 228. Smooth and glabrous or 

 the upper part of stem tomentulose or pubescent : leaves from broadly 



