308 COMPOSITE ASTER 



Bubalpine woods and meadows in the Cascade mountains, Washington to 

 California and Montana. 



A campestrts Nutt. 1. e. 293 Prninose-puberulent and yiscidulous; 

 stems 10-15 inches high, branching : leaves linear, about an inch long by 

 2-4 lines broad or the lower lingulate-spatulate, mostly glabriate , same oh- 

 scuiely 3-nerved: involucre 3-4 lines high hemispherical, of rather few- 

 ranked and little unequal linear, acute bracts pruinose-glandular : rays 

 3-4 lines long, light violet or purple. Low grounds and plains British 

 Columbia to California, Idaho and Montana. 



A. modestus Lincl. Hook. Fl. ii, 8. Merely pubescent or elabrate : 

 stems rather slender, 2-3 feet high, simple, very leafy: leaves tninnish, 

 lanceolate or broader, 1-4 inches longr, sparringly and acutely serrate or 

 denticulate, very acute, mostly narrowed to a sessile or partly clasping, but 

 not auriculate base : heads hemispherical, numerous and usually thyrsoidly 

 or cymosely congested at the summit of the stem : bracts of the involucre 

 loose and more or less herbaceous almost from the base, linear, attenuate, 

 all equalling the disk: rays numerous and narrow, pale blue to violet: styJe 

 appendages lanceolate : acbenes hirsute. Along mountain streams, Brit- 

 ish Columbia to Oregon. Saskatchewan and Pembina. 



* * Heads and infloresence, various, radical leaves all acute or at- 

 tenuate at base, not glandular nor viscid nor eilky-canescent : achenes 

 compressed, few nerved. 



A. Geyeri. A. Isevis Var. Gey eri Gray. Whole p *ant very smooth and 

 glabrous : stem stout, a foot or two high, rigid : leaves from ovate or ob- 

 long to lanceolate, 4 or 5 inches long, decreasing upward to subulate 

 bracts ; radical and lowest cauline contracted below into a winged petiole ; 

 upy er all with auriculate or subcordate partly claspfng base: heads sparse- 

 ly thyrsoid-paniculate, on short and rigid branchlets : involucre campanu- 

 late, the whitish subcoriaceous bracts mostly attenuate-acute, with ob- 

 scure green tips: rays 20-30, broadish, sky-blae to violet: achenes glabrous 

 or nearly so, 4-5 ribbed. Valleys of Idaho to the Rocky mountains. 



A. commutatus Gray Syn. Fl. i, Pt. 2, 185. Stems rather slender, 

 1-2 feet high, with divergent branches, cinereous or green : leaves small, 

 all linear and entire scarcely narrowed at the abrupt, closely sessile or 

 partly clasping base, uppermost of the branchlets passing into involueral 

 bracts, the- e mostly with obtuse tips: heads numerous, racemosely dis- 

 posed, 3-4 lines high and broad : involucre of equarrose or at least spread- 

 ing herbaceous obtuse or merely pointed tips : rays 20-30, white : achenes 

 canescent-hirsute. On plains and river banks Eastern Oregon and Wash- 

 ington to Utah and Dakota. 



A., chammissonis Gray Bot. Wilkes 341. Glabrous or above Fomewhat 

 hirsute : stems 2-5 feet high paniculately branched : leaves lanceolate, acute 

 entire or the larger obscurely serrate, 2-5 inches long, scabrous with sparse 

 appressed pubescence, or glabrous, those of the flowering brancblets be- 

 coming small or minute and squarrose-spreading : heads loosely panicled, 

 5-6 lines high : involucre broadly campanulate or somewhat obconical ; its 

 bracts numerous and imbricated in several ranks, thickish,linear-spatulate, 

 with short and rounded green tips, the outer successively shorter : rays 

 20-25 purple or violet, nearly halt inch long : achenes sparsely and mi- 

 nutely pubescent. In moist thickets cf Southern Oregon to California. 



A. menziesii Lindl. Hook. Fl. ii, 12. Minutely hoary with a fine 

 pubescence, or glabrate below; 1-2 feet high : stems and branches virgate, 

 rigid: leaves lanceolate or linear, acute, entire, or the lower obtusely ser- 

 rate, rather rigid, 1-2 inches long by 2-4 lines broad : heads racemose or 

 panicled, 45 lines high : involucre campanulate; its bracts numerous and 

 imbricated in several ranks, thickishi linear, with short usually somewhat 



