212 COMPOSITE. Erigeron. 



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

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

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

 Mountains, from British America {Drummond, Macoun) to Wyoming, S. Colorado, and 

 Utah, Nuttall, 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 Avitli sparse hirsute or hispid liairs, especially on the margins of the leaves: these 

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

 paratively large, 4 or 5 lines high : 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, Fh Colorad. 60; Gray, Proc. Am. Acad. xvi. 90. — Blealv mountain-tops, alpestrine 

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

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



•i— -i~- -)— 4— H— Various Rocky Mountain to Pacific species, with entire leaves, none truly 

 alpine, none hispidly hirsute (except very rarely some spreading bristly hairs fringing base of 

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

 ous, in several species uniformly wanting. 

 ++ A span or two high 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 half-inch long, contracted into a petiole of at least equal length, 

 einereou.sly puberulent or canescent: heads only 3 or 4 lines high: rays 18 to 30, pale violet or 

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



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

 simple from the slender caudex, monocephalous : involucre obscurely larsute, a single series 

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

 King Exp. 142. — Utah, in the E. Humboldt 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 unecjual, somewhat in 2 or 3 ranks: rays 25 to 30. — E. avspitosum, var. 

 tener um. 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 the sources 

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

 Forwood. 



++ -w- 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 from narrowh' spatu- 

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

 b-lQ-nerved or sli-iate: pappus double; 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 : liead 4 lines high : 

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

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

 by Fendler. Also on the Platte in Wyoming, Geyer. 



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

 arate hairs undistinguishable : stems 6 to 12 inches high: radical leaves very densely 

 clustered, linear-spatulate 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. ccespi- 

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

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



■H- -H- -H- A foot or less high from a thick multicipital caudex, more or less branching and 



leafy, minutely silvery-canescent (the pubescence fine and short): leaves 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. Parisllii. Rigid and rather stout, at length somewhat corymbosoly branched : leaves 



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



