ERIGERON COMPOSITE 319 



pine or subalpine in the Blue mountains of Oregon to the Rocky 

 mountains and northward. 



E. pacificus Hirsute with white hairs, s'ems seveal from a simple or 

 more or less multicipital somewhat woody perennial root, ascending, 2-4 

 inches long, leafy monocephalous: lower leaves narrowly lanceolate to al- 

 most linear, 1-2 inches long ; cauline leaves similar but smaller: heads 

 4-5 lines high ; bracts of the involucre linear-lanceolate, acute or acumin- 

 ate, hirsute: rays 30-40, blue to purple, 6 Jines long: pappus of ray- 

 flowers manifestly double, the outer very short or a mere crown, the inner 

 about equalling the disk-flowers, soon deciduous: achenes minutely 

 pubescent. On grassy slopes of the Cascade mountains near Table Rock, 

 Clackamas County, Oregon. 



<-*-*--*- Various species with entire leaves, none truly 

 alpine, none hispidly hirsute except very rarely some spreading 

 bristly hairs fringing the base of the leaves : involucre close, disposed 

 to be somewhat imbricated and rigid: rays not very nume.-oua, in 

 several species uniformly wanting. 



+* Either low or comparatively tall, leafy- stemmed or subscapose: 

 achenes compressed, 2-nerved, rarely 3-nerved. 



= Heads radiate : leaves all narrowly linear to filiform, the broad- 

 est not over a line wide: pubescence either cinerous or obscure. 



a. Involucre only 2-3 lines high of unequal and somewhat imbricated 

 bracts . 



E. nlit'olius Nutt. Trans. Am. Phil Soc.vii, 328. Canescent or cinereous 

 throughout with very fine close pubescence, no loose hairs : stems slender, 

 10-20 inches niah from a Jignescent slender base or branched rootstock 

 leafy, usually paniculately branched and bearing several or rather numer- 

 ous heads: leaves linear-filiform or quite filiform, some lower ones some- 

 times dilated upward and flat : inyolurre canescent : rays 30-50, rarely over 

 80, purple, violet or white, 3-4 linea long : achenes slightly pubescent or 

 glabrate: pappus simple, of fragile and indistinctly scabrous bristles. 

 Rocky or dry sandy ground, Eastern Oregon to British Columbia and 

 Idaho. 



E. peueephyllus Gray Syn. Fl. i, Pt. 2, 213. Hoary with a minute 

 appressed pubescence : stems slender, 4-12 inches high, usually sparingly 

 branched : leaves narrowly linear, 1-2 inches long by half of a line wide, 

 flat: involucre 3-4 lines high; its narrowly lanceolate bracts unequal, 

 hirsute : rays 20-30, 4-6 lines long, bright yellow : pappus double, the outer 

 squamellate : achenes smooth or nearly so : Dry hills Eastern Oregon and 

 Washington near the Cascade mountains. Dr. Gray evidently had two or 

 three species mixed in his description of E. peuctphyllus, the above des- 

 cription is for the yellow-flowered one only. 



b. Involucre 3-4 lines high, of equal bracts : rays of equal length. 



E. ochrolencns Nutt. Trans. Am. Phil. Soc. vii, 309. Cinereous- 

 pubescent to glabrate: stems 10-18 inches high, somewhat cespitose, 

 usually simple, naked above and monocephalous, occasionally with one or 

 two additional heads: leaves rather rigid, narrowly linear, the radical 2-3 

 inches loner, often a line wide at the upper part, n->t rarely sparsely 

 hirsute-ciliate below : involucre tomentose or hirsute pubescent : rays 40-60, 

 ochroleucous, white or purplish: outer pappus setulose. Gravelly hills 

 and plains, Idaho to Montana and Wyoming. 



= == Heads rayl&ss; leaves filiform to narrowly spatulate-linear, 



chiefly from the multifnipital caudex : stems more or less scapiform and 



monocephalous. 



E. Bloomeri Gray Proc. AnuAcad. vi;40. Densely cespitose, cinereous- 



