Eri^eron. COMPOSITE. 213 



involucre cinercous-pnberulciit and glandular : rays nearly half-inch long, purple : disk- 

 corollas beset with some sparse and sliort minute hairs : akeues sparsely hirsute : pappus 

 conspicuously double ; outer setose-squamellate. — llocky caiious, borders of the Mohave 

 Desert, S. E. California, Purisli. 

 E- Utahensis, Guay. 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-i)eduncled : involucre cauescent : rays fully half-inch long : disk-corollas sparsely hirsute 

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

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

 xvi. 99. E. stenophijll.us, var. 1 tetrapleurus, Proc. Am. Acad. viii. 650. — Pocky hills in the 

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

 showy species, nearly related to E. ar<jentutus, all with a close and somewhat imbricated 

 involucre. 



+-i- ++ -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 ra3's half-inch long. 

 E. stenophyllus, Gray. Green and glabrate, hut ob.scurely .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. R. Rep. iv. 42; Proc. Am. Acad. viii. CiO, & xvi. 89. — 

 Hills on the Pecos, N. W. Texas, Dii;clow. A smaller plant from Fort Wingate, New 

 Miaxico, Matthews, may belong here, but has merely liirsutulous young akenes. 



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

 lines long. 



E. filifolius, NuTT. Cauescent 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 cauescent : rays 30 to 50, rarely even 80, purple, violet, 

 or white, 3 or 4 lines long : akeues slightly pubescent or glabrate : pappus simple, of fi-agile 

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

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

 next. Chrijsopsis canescens, DC. Prodr. v. 328. — Rocky or dry ground, from Brit. Columbia, 

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

 first coll. by Doiir/las. 



E. peucephyllus, Gray. 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, ciuereouspuberulent or glal»rate : 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, Macoun) to the Sierra Nevada in 

 California and adjacent Nevada, cast to Idaho. 



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

 E. ochroleucus, Ni:tt. Low, a span or two high, somewhat cespitose on the caudex, 

 from cincreous-j)ubcsceut to glabrate, ami attenuate lower part of the leaves not rarely 

 sparsely hirsute-ciliate : stems usually simple, naked above and monocej)halous, occasionally 

 with one or two additional heads: leaves rather rigid, narrowly luiear, 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 he yellow): outer pappua 

 setulose.— Trans. Am. Phil. Soc. vii. 309; Torr. & Gray, Fl. 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, cauescent form. Diplopappus linearis, Hook. Fl. 



