320 COMPOSITE ERIGERON 



puberulent to glabrate : stems 2-6 inches high : radical leaves 1-3 inches 

 long, the larger dilated upward, sometimes to a line or more wide; cauline 

 feW and nearly filiform: heads almost half inch high: bracts of the 

 involucre linear lanceolate, equal, soft-villous or canescent: rays wanting: 

 achenes glabrate, oblong-linear, flat: pappus whitish, simple. Stony ground 

 Idaho to Eastern Oregon and California. 



E. nudatus Gray Proc. Am. Acad. xx, 297. Glabrous throughout 

 or the involucral bracts sparingly puberulent, cespitose : stems scapiform, 

 2-6 inches high, monocephalous: leaves linear-spatulate to almost filiform, 

 1-2 inches long, rarely a line wide : involucre nearly half-inch high, of thick- 

 ish and green lanceolate bracts: achenes rbovate-oblong, sparsely pubes- 

 cent: pappus whitish, simple. Rocky hillsides about Waldo, Josephine 

 Co., Oregon. 



==== = Heads radiate : leaves from narrowly linear to oblong : 

 stems leafy and disposed to branch but sometimes monocephalous : 

 pubescence cinereous : outer pappus setulose, sometimes rather mani- 

 fest, sometimes obscure or none. 



E. corymbosns Nutt. 1. c. Stems erect from a creeping rootstock often 

 afoot or two high, soft-cinereous or sometimes hispidulous with mostly 

 spreading short pubescence : radical leaves narrow- lanceolate or spatulate~ 

 lanceolate, largest 3-4 inches long, 3-4 lines wide, 3 nerved ; cauline linear 

 and narrow : heads sometimes solitary, usually several and corymbosely 

 disposed on short slender peduncles-: involucre 3 lines high, canescently 

 pubescent: rays 30-50, mostly narrow and 3-5 lines long, blue or violet, ap- 

 parently sometimes white. Mountains of eastern Oregon and Washing- 

 ton to Montana. 



E. conflnus Howell Eryth. iii, 35. Stems simple, one to several from 

 a woody perennial root, 4-8 inches high, very leafy: leaves narrowly 

 spatulate-linear, an inch long or more: heads usually solitary at the ends 

 of the stem, but often several together : involucre hemispherical, its linear 

 acuminate bracts in few ranks nearly equal, 3-4 lines long : rays numer- 

 ous, rather broad, 6-10 lines long, purplish; pappus a single series of 

 barbel late-scabrous bristles : achenes sparingly pubescent. On high rocky 

 ridges of the Siskiyou mountains. 



E. de.cumbens Nu*t. 1. c., 309. Strigulose-pubescent or puberulent or 

 glabrate: stems slender, commonly low or spreading, 6-18 inches high, 

 leafy, branched above: leaves linear or sometimes linear-spatulate; 

 radical 2-6 inches long by 1-3 lines broad : involu re minutely hirsute or 

 pubescent: rays 20-40, white purplish or violet tinged. From the 

 Willamette Valley, Oregon, to Montana and Utah. 



= = == = Heads wholly rayless: stems leafy to the summit: 

 pappus simple. 



E. iiiornatus Gray. Proc. Am. Acad. xvi, 88. Commonly glabrous 

 throughout and smooth, or with some spase hirsute pubescence: stem 

 10-20 inches high, erect: leaves from broadly to narrowly Pnear, 1-2 

 inches long by 1-2 lines wide : heads usually several and crymosely disposed 

 at the summit of the stem, short-ped uncled, 3 lines bigh: involucre cam- 

 panulate, its bracts somewhat imbricated, very glabrous unequal. Com- 

 mon in dry open woods from Mount Adams Washington to California. 



* * * * Perennials with membranaceous commonly serrate or 

 dentate leaves and middle-sized or small heads with glabrate in- 

 volucre : rays numerous : pappus quite simple. 



*- Rays not very narrow, not more than 60 or 70. 

 E. Oreganus Gray. Proc, Am. Acad. xix, 2. Pubescent throughout: 



