212 COMPOSITE]:. Erigeron. 



almost naked, then glabrous ; no glandular roughness : involucre more or less villous-pubes- 

 ceut (barely 3 lines high) : rays white or purplish, 2 or 3 lines long. — Fl. ii. 17. E. nanus 

 & E. railicatus, Nutt. Trans. Am. I'hil. Soc. vii. 308. — Alpine or subalpiue in the Rocky 

 Mountains, from British America {Druminond, Mucoun) to Wyoming, S. Colorado, and 

 Utah, Nntta/I, Parry, &c. 

 E. glandulosus, T. C. Porter. Cespitose from a stout caudex, a span to almost a foot 

 higli, rigid, minutely granulose-glandular or glandular-scabrous (but sometimes obsoletely 

 so), and witli sparse hirsute or hispid hairs, especially on the margins of the leaves: these 

 tliickish, spatulate to linear-oblanceolate, 1 to 3 inches long ; upper cauline small : head com- 

 paratively large, 4 or 5 lines higli : involucre glandular or viscid as well as pubescent : rays 

 40 or 50, violet or purple, 4 to 6 lines long: an obscure outer setulose pappus. — Porter & 

 Coulter, Fl. Colorad. GO ; Gray, Proc. Am. Acad. xvi. 90. — Bleak mountain-tops, alpestrine 

 and subalpine, and sometimes descending to lower levels, Colorado, J. 31. Coulter, Hall & 

 Harbour, Greene, &c. Some forms approach E. pumilus. 



•i— -i— 4— -H- -t— Various Rockv Mountain to Pacific species, with entire leaves, none truly 

 alpine, none hispidly liirsute (except very rarely some spreading bristly liairs fringing ba.«e of 

 leaves): involucre close, disposed to be somewhat imbricated and rigid: rays not very numer- 

 ous, in several species uniformly wanting. 



++ A span or two liigh from a simple or multicipital caudex: leaves only few and narrow on the 

 weak and ascending simple or sparingly branched flowering stems; but radical ones with ob- 

 ovate or spatulate blade, only lialf-inch long, contracted into a petiole of at least equal length, 

 cinereously puberulent or canescent: heads only 3 or 4 lines high: rays 18 to 30, pale viokt or 

 purple: akenes compressed, 2-3-nerved: pappus nearly simple. 



E. asperugineus, Gray. Cinereous with minute roughish pubescence : stems commonly 

 sin)ple fnnn the .slender caudex, monocephalous : involucre obscurely hirsute, a single series 

 of equal bracts : rays 18 or 20. — Proc. Am. Acad. xvi. 91. Aster asperuz/ineus, Eaton, Bot. 

 King Exp. 142. — Utah, in the E. Huml)oldt Mountains, Watson, M. E. Jones. 



E. tener, Gray, 1. c. Canescent with very fine and close or almost imperceptible pubescence 

 (either silvery-whitish or becoming greener) : stems several from a stouter caudex, weak 

 and ascending, bearing single or 2 or 3 heads : involucre minutely canescent ; its narrow 

 and close bracts unequal, somewhat in 2 or 3 ranks: rays 25 to 30. — E. ca'spitosum, var. 

 teneriim. Gray, Bot. Calif, i. 328 — High mountains of Utah, N. W. Nevada, and of the 

 Sierra Nevada on the borders of California, Watson, Brewer, &c., to those near tlie sources 

 of the Sacramento, Pringle, Eed Rock Creek, and of Wind River, Montana, Watson, Dr. 

 Forwood. 



++ -H- A span to near a foot high, cespitose on a stout multicipit 1 caudex, silvery-canescent, with 

 simple and monocephalous or rarely somewhat branching stems: leaves fi'om narrowly spatu- 

 late to linear: rays 40 or 50, white or purple clianging to wliite: akenes slender and nearly terete, 

 b-10-nerved or striate: pappus doidjle; the outer subulate-setulose and conspicuous. 



E. canus, Gray. Silvery appressed pubescence obviously strigulose under a lens, that of 

 the involucre loose and spreading: stems 4 to 9 inches high, leafy: linear cauline leaves 

 gradually diminishing upward; radical spatulate lanceolate or narrower: head 4 lines high: 

 rays narrow, 3 lines long: akenes glabrous, striatcly 8-10-nerved. — PI. Fendl. 67, & Proc. 

 Am. Acad. viii. 650. — Dry and gravelly hills, Northern New Mexico and Colorado ; first coll. 

 by Frndler. Also on the Platte in Wyoming, Geijer. 



E. argentatus, Gray. Silvery white pubescence throughout very close and fine, the sep- 

 arate hairs nndistinguishable : stems 6 to 12 inches higli : radical leaves very densely 

 clustered, linear-spatnlate or broader, inch or two long ; cauline scattered and much smaller : 

 head broad, fully half-inch high : rays rather broad and large, half-inch long : immature 

 akenes sericeous-pubescent or villous, 5-8-nerved. — Proc. Am. Acad. viii. 649. E. cwspi- 

 tosum, Eaton, Bot. King Exp. 153, in small part (no. 549), not Nutt. — Arid interior region, 

 Utah and Nevada, Watson, Miss Starls, Ward, Palmer, M. E. Jones. 



++++++ A foot or less high from a thick multicipital caudex, more or less branching and 

 leafy, minutely silvery-canescent (the pubescence fine and short): loaves all narrowly linear : 

 rays 30 to 50, elongated (large for the involucre of about 3 lines high), purple or sometimes 

 white: akenes narrow, 4-nerved, disposed to be tetragonal. 



E. Parishii. Rigid and rather stout, at length somewhat corymbosely branched : leaves 

 spatulate-liuear (largest 2 lines wide or nearly so), rather short: heads short-peduuded : 



