212 COMPOSITvE. 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 Hues long. — Fl. ii. 17. E. nanus 

 &Jl. radicatus, Nutt. Trans. Am. Thil. Soc. vii. 308. — Alpine or subalpine iu the Rocky 

 Mountains, from British America (Drmaiiunid, Mucoun) to Wyoming, S. Colorado, and 

 Utah, Nuttall, Parry, &c. 

 B. glandulosUS, T. C. Porter. Cespitose from a stout eaudex, a span to almost a foot 

 high, rigid, minutely granulose-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. 60 ; Gray, Proc. Am. Acad. xvi. 90. — Bleak mountain-tops, alpestriiie 

 and subalpine, and sometimes descending to lower levels, Colorado, J. iJ. Cuulttr, Hall & 

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



H— ^_ ^— -I— -I— Various Piocky 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 multicipital eaudex: 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 halt-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-nerved: pappus nearly simple. 



B. asperilgineus, Gray. Cinereous with minute roughish pubescence : stems commonly 

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

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

 King K.\]>. 142. — Utah, in the E. Humboldt Mountains, Watson, iJ. E. Jones. 



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

 (either silvery-whitish or liecoming greener) : stems several from a stouter eaudex, 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'spiiosum, var. 

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

 Sierra Xe\ ada on the borders of California, Wutson, Breu-er, &c., to those near the sources 

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

 F„nr,„„t. 



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

 simple and monocephalous or rarely somewliat bi'anchiiig stems; leaves from narrowly spatu- 

 late to lineiir ; rays 40 or 50, white or purple changing to white : aJceni s slender and nearly terete, 

 5-10-neri)ed ur striate : pappus double; the outer subulate-setulose and conspicuous. 

 B. canus, Gray. Sihery 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. Fendl. 67, & Proc. 

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

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

 B. argentatus, Gr.vy. Silvery white pubescence throughout very close and fine, the sep- 

 arate hairs undistinguishable : stems 6 to 12 inches high: radical leaves ver\- denselv 

 clustered, liuear-spatulate or broader, inch or two long; cauline scattered and much smaller: 

 head hr<jad, 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.ca:spi- 

 tosum, Eaton, Bot. King Ex]). 1.53, in small part (no. 549), not Nutt. — Arid interior region, 

 Utah iind Nevada, Watson, Miss Searls, Ward, Palmer, M. E. Junes. 



•H- ++ ++ A foot or less high from a thick multicipital eaudex, more or less branching and 



leafy, minutely silvevj'-canestent (the pubescence tine and short): loaves all narrowly linear: 



rays :i(l to 50, elongated (large for tlie involucre of about 3 lines liigh), purple or sometimes 



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



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



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



