820 COMPOSIT A ERIGERON 
uberulent to glabrate: stems 2-6 inches high: radical leaves 1-3 inches 
ong, 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, »blong-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 cbovate-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. corymbdésus Nutt. 1.c. Stems erect from a creeping rootstock often 
a foot 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 3-5lines long, blue or violet, ap- 
parently sometimes white. Mountains of eastern Oregon and Washing- 
ton to Montana. 
E. confinus 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 
barbellate-scabrous bristles : achenes sparingly pubescent. On high rocky 
ridges of the Siskiyou mountains. 
E. decumbens Nutt. 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: involuvre 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. inornatus 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 linear, 1-2 
inches long by 1-2 lines wide : heads usually several and crymosely disposed 
at the summit of the stem, short-peduncied, 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: 
