174 COMPOSITE. (composite family.) 



Var. Beyrichii, Gray. A slender form, with minute or even cinereous 

 pubescence, smaller heads, and rays from white to pale rose-color. — Synopt. 

 PL i. 219. Within the eastern limits of our range. 



§ 2. Ray* inconspicuous or slender, numerous, sometimes not exceeding the disk: 

 within them a series of raijless filiform female flower* [commonly none in No. 

 29) : leaves entire or nearly so: /xi/ipus simple. — Trimorphjba. 



28. E. acris, L. More or less hirsute pubescent, varying towards glabrous 

 (not glandular) : cuuline leaves mostly lanceolate, the lower and radical spatu- 

 'ate: involucre hirsute: rays slender, equalling or moderately surpassing the 

 disk and pappus, pui'ple : filiform female flowers numerous. — In the mountains 

 of Colorado and northward to British Columbia, thence across the continent. 



Var. Droebaehensis, Blytt. Somewhat glabrous, or even quite so: 

 involucre also green, naked, at most hirsute only at the base, often minutely 

 viscidulous: slender rays somewhat slightly exserted, sometimes minute and 

 filiform and shorter than the pappus. — Same range as the type. 



Var. debilis, Gray. Sparsely pilose : stems a span to a foot high, slender, 

 1 to 3-cephalous : leaves bright green ; radical obovate or oblong ; cauline 

 spatulate to lanceolate, short : involucre sparsely hirsute or upper part 

 glabrate, the atteuuate tips of the bracts spreading : rays in flower rather 

 conspicuously surpassing the disk. — Synopt. Fl. i. 220. Mountains of N. 

 Montana, northward and eastward. 



29. E. armerisefolius, Turcz. Sparsely hispid-hirsute or the leaves gla- 

 brous and most of the narrowly linear and elongated cauline bristi y-ciliate : 

 inflorescence more racemose and strict : involucre sparsely hirsute : rays filiform, 

 extremely numerous, slightly surpassing the disk, whitish, no filiform raijless 

 flowers seen. — From the mountains of California and Colorado to the Sas- 

 katchewan. 



§ 3. Bays of the small (2 lines high) and narrow seemingly discoid (and mostly 

 thyrsoid-paniculate) heads inconspicuous, little if at all surpassing the disk or 

 pappus : leaves more or less hispid-ciliate. — C.exotus, in part. 



30. E. Canadensis, L. From sparsely hispid to almost glabrous : stem 

 strict, 1 to 4 feet high, with numerous narrowly paniculate heads, or in depauper- 

 ate plants only a few inches high and with few scattered heads : leaves lint or, 

 entire, or the lowest spatulate and incised or few-toothed : rays white, usually a 

 little exserted and surpassing the style-branches. — Waste grounds, throughout 

 the continent. 



31. E. divaricatus, Michx. Low, a span to a foot nigh, diffusely much 

 branched, somewhat fastigiate : leaves all narrowly linear or subulate, entire : 

 rays purplish, rarely surpassing the style-branches of the pappus. — Fl. ii 123. 

 Open grounds from Colorado to the Mississippi Valley. 



15. CONYZA, Less. 



I. C. Coulteri r Gray. A foot or two high, commonly branched, bearing 

 numerous small heads in a mostly crowded thyreoid leafy panicle, viscidly 

 pubescent or partly hirsute : cauline leaves linear-oblong, the lower spatulate- 

 oblong and with partly clasping base, from dentate to laciniate-pinnatifid, an 



