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. — PL ii. 17. E. nanus 

 & E. radicatus, Nutt. Trans. Am. Phil. Soc. vii. 308. — Alpine or subalpine in the Rocky 

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

 Utah, Nuttall, Parry, &c. 

 B. glandulosus, T. C. Poeteb. Cespitose from a stout caudex, a 'span to almost a foot 

 high, rigid, minutely granulose-glandular or' glandular-scabrous (bat 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, PI. Colorad. 60 ; 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. 



-l^ H — -i — H — 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: rays 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, 

 cinereously 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. asperugineus, 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 asperugineus, Eaton, Bot. 

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



E. tener, Geay, 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. cozspitosum, var. 

 tenerum, 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- -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 or purple changing to white : akenes slender and nearly terete, 

 5-10-nerved or striate : pappus double ; the outer subulate-setulose and conspicuous. 

 B. oanus, 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-nerved. — PI. Pendl. 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, Geyer. 

 E. argentatus, Geay. 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. caspi- 

 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. 



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



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



