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. radical us, Nutt. Trans. Am. Phil. Soc. vii. 308. Alpine or subalpiue in the Rocky 

 Mountains, from British America (Dnunmond, Macoun) to Wyoming, S. Colorado, and 

 Utah, Nuttall, Parry, &c. 



E. gland ulosus, T. C. PORTER. Cespitose from a stout caudex, a span to almost a foot 

 hio-h, rigid, minutely grauulose-glandular or glandular-scabrous (but sometimes obsoletely 

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

 thickish, spatulate to linear-oblanceolate, 1 to 3 inches 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, Fl. Colorad. GO ; Gray, Proc. Am. Acad. xvi. 90. Bleak mountain-tops, alpestrine 

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

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



i .j H__ -i -i 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: rays not very numer- 

 ous, in several species uniformly wanting. 



H- A span or two high from a simple or nmlticipital caudex: leaves only few and narrow on the 

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

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

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

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



E. asperilgineus, GRAY. Cinereous with minute roughish pubescence : stems commonly 

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

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

 King Exp. 142. Utah, in the E. Huraboldt Mountains, Watson, M. E. Jones. 



E. tener, GRAY, 1. c. Cauescent 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 cauescent ; its narrow 

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

 tenentm; 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. 



in- -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 from narrowly spatu- 

 late to linear: rays 40 or 50, white 6"r purple, changing to white : akems slender and nearly terete, 

 b-lQ-nerved or striate: 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 : head 4 lines high : 

 rays narrow, 3 lines long: akenes glabrous, striately 8-10-uerved. PI. Feiidl. 67, & Proc. 

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

 by Fendler. Also on the Platte in Wyoming, Ge/jcr. 



E. argentattlS, 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.r<ix/>i- 

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

 Utah and Nevada, ]\'alson, 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 corymbosely branched : leaves 

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



