214 COMPOSITtE. Erigeron. 



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

 Geyer, Parry, &c. 



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

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



E. Bloomeri, Gray. Densely cespitose, cinereous-puberulent or glabrate and pale : radical 

 loaves 1 to 3 inches long, the larger dilated uj:)ward sometimes to a line or more in width ; 

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

 half an inch high : involucral bracts equal, linear-lanceolate, soft-villous or cauesceut : akenes 

 glabrate, oblong-linear, flat : pappns 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 Xevada, 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 nionocephalous, only a span or two high: pappus 

 simple. 



E. Nevadensis, Gray. Stems numerous from a nmlticipital 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-cinereous ; 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 : akenes comparatively large : pappus rather 

 coarse. — Proc. Am. Acad. viii. 649; Bot. Calif, i. 328. E. caspitosus, var. (jrandijlorus, 

 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. pygm^US, 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) ami Mono Pass (10,750 feet). Brewer. Also Mount 

 Dyer, 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 monoceplialous 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 spar.sely hirsute involucre little unequal : rays 

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

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

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



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

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



E. caespitosus, Nutt. Low, a span to rarely a foot high, manj'-stemmcd 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 

 and appressed, 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 short-peduncled, 3 or 4 lines high : bracts of the involucre rather unequal : rays 

 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 canesccns 

 {Erigeron cane.scens, Torr. & Gray, 1. c.) & D. grandifloriis (E. CAtspitosiis, var. grandijiorus, 

 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 his])idulous 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 ; cauline linear and narrow : heads sometimes solitary, usually several and 

 corymbosely disposed on short slender peduncles : involucre 3 lines high, canesceutly pube.s- 

 ceut: 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 



