308 COMPOSITE ASTER 



gubalpine woods and meadows in the Cascade mountains, Washington to 

 California and Montana. 



A campestrls Nutt. 1. c. 293 Prninose-puberulent and viscidulous; 

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

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

 Bcuiely 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, li^ht violet or purple. Low grounds and plains British 

 Columbia to California, Idaho and Montana. 



A. modestns Lincil. Hook. FI. ii, 8. Merely pubescent or glabrate: 

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

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

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

 not auriculate fcase : heads hemispherical, numerous and usually th^rsoidly 

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

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

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

 appeodages 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 silky-canescent : acheues 

 compressed, few nerved. 



A. Geyeri. A. Isevis Var. Oeyeri 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 siibulite 

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

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

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

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

 scure g'eentips: rays 20-30, broadish, sky-blue to violet: achenea glabrous 

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



A., commntatns 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 involucral 

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

 posed, 3-4 lines high and broad : Involacre of squarrose or at least spread- 

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

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

 ington to Utah and Dakota. 



A. chammlssouis 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 loag, scabrous with sparse 

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

 comiog 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,Unear-spatulate, 

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

 20-26 purple or violet, nearly halt inch long : achenes sparsely and mi- 

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



A. menziesil 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, 4~5 lines high : involucre campanillatB; its bracts numerous and 

 imbricated ift several ranks, thickish, lineat, with Short usually somewhat 



