Erigeron. COMPOSITE. 213 



involucre cinereous-puberulent and glandular: rays nearly half-inch long, purple: disk- 

 corollas beset with some sparse and short minute hairs: akenes sparsely hirsute: pappus 

 conspicuously double ; outer setose-squamellate. — Eocky canons, borders of the Mohave 

 Desert, S. E. California, Parish. 

 E. Utah6nsis, Gray. Slender, but rigid, with sparse branches from dense clumps : leaves 

 narrowly linear or almost filiform (larger 2 inches long and barely a line wide) : heads slen- 

 der-peduncled : involucre canescent : rays fully half-inch long : disk-corollas sparsely hirsute 

 toward the base : immature akenes villous : pappus almost simple ; the outer being scanty 

 and setulose, hardly distinguishable from the villous hairs of the akene. — Proc. Am. Acad. 

 xvi. 99. E. stenophi/llus, var. ? tetrapleurus, Proc. Am. Acad. viii. 650. —Rocky hills in the 

 arid region of S. Utah, Mrs. Thompson, Parry, Palmer. This and the preceding are 

 showy species, nearly related to ,E. argentatus, all with a. close and somewhat imbricated 

 involucre. 



++ ++ -H- ++ Either low or comparatively tall, leafy-stemmed or subscapose : akenes compressed, 

 2-nerved, rarely 3-nerved. 



= Heads radiate : leaves all narrowly linear to filiform, the broadest not over a line wide : pubes- 

 cence either cinereous or obscure. (Also one or two of the following subdivision are sometimes 

 very narrow-leaved.) 



a. Involucre of the ample head half-inch high, of linear and equal bracts; and rays half-inch long. 

 E. stenopll^llus, Geay. Green and glabrate, but obscurely strigulose-puberulent when 



young : stems simple and monocephalous, less than a foot high, naked and pedunculiform at 

 summit : leaves mostly 2 inches long, hardly widening upward ; upper ones sparse and 

 smaller : bracts of involucre somewhat hirsute-pubescent and glandular : ovary villous : 

 pappus simple or nearly so. — Pacif. B. Rep. iv. 42 ; Proc. Am. Acad. viii. 650, & xvi. 89. — 

 Hills on the Pecos, N. W. Texas, Bigelow. A smaller plant from Port Wingate, New 

 Mexico, Matthews, may belong here, but has merely hirsutulous young akenes. 



b. Involucre only 2 or 3 lines high, of shorter and unequal somewhat imbricated bracts: rays 2 to 4 

 lines long; 



E. filifolius, Nutt. Canescent or cinereous throughout with very fine close pubescence, no 

 loose hairs : stems slender, a span to two feet high from lignescent slender base or branched 

 rootstock, leafy, usually paniculately branched and bearing several or rather numerous heads : 

 leaves linear-filiform or quite filiform (some lower ones occasionally dilated upward to a 

 line in width and flat) : involucre canescent: rays 30 to 50, rarely even 80, purple, violet, 

 or white, 3 or 4 lines long : akenes slightly pubescent or glabrate : pappus simple, of fragile 

 and indistinctly scabrous bristles. — Trans. Am. Phil. Soc. vii. 328 ; Torr. & Gray, PI. ii. 177 ; 

 Gray, Proc. Am. Acad. xvi. 89. Diplopappus filifolius, Hook. Fl. ii. 21, is either this or the 

 next. Chrysopsis canescens, DC. Prodr. v. 328. — Eocky or dry ground, from Brit. Columbia, 

 mostly east of the Cascades, and Idaho, to the Sierra Nevada in California and Nevada ; 

 first coll. by Douglas. 



E. peucephyllus, Gkat. Low, with flowering stems a span or two high from broad 

 depressed tufts, simple and with naked summit or peduncle monocephalous or occasionally 

 forking and 2-3-cephalous, cinereous-puberulent or glabrate : leaves filiform or lowest 

 slightly dilated upward (to not over half a line in breadth) : involucre hirsute-pubescent or 

 glabrate : rays 20 or 30, usually short (2 or 3 lines long), pale blue to cream-color or pure 

 yellow : pappus manifestly double, the outer squamellate. — Proc. Am. Acad. xvi. 89. — Dry 

 hills, from Brit. Columbia (and east to Cypress Hills, Macpun) to the Sierra Nevada in 

 California and adjacent Nevada, east to Idaho. 



c. Involucre 3 or 4 lines high, of equal bracts: rays of equal length. 

 E. OChroleilOUS, Nutt. Low, a span or two high, somewhat cespitose on the caudex, 

 from cinereous-pubescent to glabrate, and attenuate lower part of the leaves not rarely 

 sparsely hirsute-ciliate : stems usually simple, naked above and monocephalous, occasionally 

 with one or two additional heads : leaves rather rigid, narrowly linear, the radical (2 or 3 

 inches long) often a line wide at the upper part : involucre tomentose or hirsute-pubescent : 

 rays 40 to 60, " ochroleucous," white, or purplish (not known to be yellow) : outer pappus 

 setulose. —Trans. Am. Phil. Soc. vii. 309; Torr. & Gray, PI. ii. 178; Gray, Proc. Am. 

 Acad. xvi. 89, excl. var. E. pumilus, Hook. Lond. Jour. Bot. vi. 242, in part, not Nutt. E. 

 canescens, Parry in Jones Exp. no. 139, canescent form. Diplopappus linearis, Hook. PI. 



