ERIGERON COMPOSITJE 319 



pine or subalpine in tie Blue mountains of Oregon to the Kocky 

 mountains and northward. 



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

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

 inches long, leafy monoq^phalous : lower leaves narrowly lanceolate to al- 

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

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

 ate, hirsute: rays 30-40!, blvle to purple, 6 lines long: pappus of ray- 

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

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

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

 Clackamas County, Oregon. 



■^ +■ -^ +7 ■+- Various species with entire leaves, none truly 

 alpine, none hisjjidly hirsute except very rarely some spreading 

 bristly hairs fringing the b?,8e of the leaves : involucre close, disposed 

 to be somewhat imbrica^d and rigid: rays not very nume.'oua, in 

 several species uniformly wanting. 



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

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



= Heads radiate; leay^s 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. fllifolins Kutt. Traiis. Am. Phil Soc.vii,328. Canescent or cinereous 

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

 10-20 inches biiih from a lignescent slender base or branched rootstock 

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

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

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

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

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

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

 Idaho. 



E. pencephyllns Gray Syh. 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, 4t6 lifies long, bright yellow : pappus douhle, 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 m his description of E. peucuphyllus, the above des- 

 cription is for the yellow-flowered one only. 



b. Involucre 3-4 line's high, of equal bracts : rays ol equal length. 



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

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

 usually simple, naked above ^hd monocephalous, occasionally with one or 

 two additional heads : l^ves rather rigid, narrowly linear, the radical 2-3 

 inches lone, often a line 'Vt'ide at the upper part, not rarely sparsely 

 hirsute-ciliate below : in^pltjcre tomentose or hirsute pubescent : rays 40-60, 

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

 and plains, Idaho to Iiiontana and Wyoming. 



= = Heads raiigs? : leaves filiform 10 narrowly spatulate-linear, 



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



monocephalous. 



E . Bloitmeri Gray Proc, Am. Acad, vi, 40. Peneely cespitoge, cinereous- 



