214 COMPOSITE. Erigeron. 



ii. 21 ? Gravelly hills and plains, N. Wyoming and Montana to Idaho, Nuttall, Spaldhuj, 



Geyer, Parry, &c. 



= = Heads rayless : leaves filiform to narrowly spatulate-linear, chiefly from the multicipital 



caudex: dwarf flowering stems more or less scapiform and monocephalous. 



E. Bloomeri, GRAY. Densely cespitose, cinereous-puberuleut or glabrate and pale : radical 

 leaves 1 to 3 inches long, the larger dilated upward sometimes to a line or more iu width ; 

 cauline few and nearly filiform : scapiform flowering stems 2 to 6 inches high : head almost 

 half an inch high : iuvolucral bracts equal, linear-lanceolate, soft-villous or canesceut : akenes 

 glabrate, oblong-linear, flat : pappus whitish, simple. Proc. Am. Acad. vi. 40, & Bot. Calif. 

 i. 328; Eaton, Bot. King Exp. 148. Stony ground, mountains of Nevada to Idaho, and 

 from the Sierra Nevada, California, to E. Oregon; first-coll, by Bloomer. Habit of the last 

 preceding species, to which it is most allied. 



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



a. Stems naked above, more commonly simple and inouocephalous, only a span or two high : pappus 

 simple. 



B. Nevadensis, GRAY. Stems numerous from a multicipital caudex, erect, a span to 

 nearly a foot high : leaves all lanceolate or linear ; radical 1 to 4 inches long, 1 to 4 lines 

 wide, strigulose-ciuereous ; uppermost small and subulate : head always solitary, half-inch 

 high : involucre villous-pubescent, sometimes glabrate ; its bracts equal : rays rather broadly 

 linear, white or pale blue, 4 to 6 lines long : akeues comparatively large : pappus rather 

 coarse. Proc. Am. Acad. viii. 649; Bot. Calif, i. 328. E. vtspitosus, var. grandiflorus, 

 Eaton, Bot. King Exp. 153, in part. Sierra Nevada, California, and W. Humboldt Moun- 

 tains, Nevada, at 5,000 to 8,000 feet ; first coll. by Bloomer, Watson, c. Appears to pass 

 into the somewhat doubtful 



Var. pygmaeus, GRAY, 1. c. Dwarf, subcaulescent : leaves spatulate-linear, an inch 

 or more long, a line or so wide, more minutely pubescent or cinereous, and glabrate : head 

 considerably smaller : involucre slightly hirsute : rays purple. Sierra Nevada, California, 

 above Ebbett's Pass (at 9,500 feet) aud Mono Pass (10,750 feet), Brewer. Also Mount 

 Dver, Plumas Co. (a connecting form), Mrs. Austin. 



E. Eatoni, GRAY. Stems several from the crown of a strong tap root, slender and weak, 

 diffuse, 3 to 9 inches long, simple or with 2 or 3 monocephalous branches : leaves all linear, 

 thickish, minutely strigulose-pubescent ; radical about 2 inches long and the broadest 2 lines 

 wide : heads only 3 lines high : bracts of the sparsely hirsute involucre little unequal : rays 

 seldom over 20, at most 3 lines long, white or purplish. Proc. Am. Acad. xvi. 91. E. uchro- 

 leucus, Eaton, Bot. King Exp. 152, not Nutt. Kooky Mountains of Colorado and Wyoming, 

 and the Uiuta and Wahsatch Mountains in Utah; first coll. by Watson and Eaton. 



b. Stems more leafy and disposed to branch, but sometimes monocephalous: pubescence cinereous: 

 outer pappus setulose, sometimes rather manifest, sometimes obscure or none. 



E. caespitosus, NDTT. Low, a span to rarely a foot high, many-stemmed and ascending 

 or spreading from a stout multicipital caudex, from cinereous to canescent with dense and 

 fine short pubescence (this generally spreading and soft, sometimes hispidulous, rarely fine 

 aud ap pressed, at least on young parts): stems of smaller plants monocephalous: radical 

 leaves spatulate to lanceolate, and cauline lanceolate-oblong to linear (half-inch to 2 inches 

 long) : heads sliort-peduucled, 3 or 4 lines high : bracts of the involucre rather unequal : ravs 

 40 or 50, linear, 3 or 4 lines long, white, sometimes tinged with rose-color. Trans. Am. 

 Phil. Soc. vii. 307 (a small and low form) ; Torr. & Gray, Fl. ii. 179. Diplopappus canescens 

 (Erigeron canescens, Torr. & Gray, 1. c.) & D. grandiflorus (E. ca-spitosus, var. grandiflorus, 

 Torr. & Gray, 1. c.), Hook. Fl. ii. 21, the latter a large form. Mountains and high plains, 

 Saskatchewan and Montana to Utah and borders of New Mexico, and eastern part of the 

 Sierra Nevada, California. A variable species. Western forms come near to the next. 



E. COrymbosus, NUTT. Taller, often a foot or two high, erect from creeping rootstocks, 

 soft-cinereous or sometimes hispidulous with the mostly spreading short pubescence : radical 

 leaves narrow-lanceolate or spatulate-lanceolate (largest 3 or 4 inches long and 3 or 4 lines 

 wide), 3-nerved ; cauliue linear and narrow : heads sometimes solitary, usually several and 

 corymbosely disposed on short slender peduncles : involucre 3 lines high, cauesceutly pubes- 

 cent : rays 30 to 50, mostly narrow and 3 to 5 lines long, blue or violet, apparently some- 

 times white. Trans. Am. Phil. Soc. vii. 308 ; Torr. Gray, 1. c. ; Gray, Bot. Calif, i. 329 



