Erigeron. COMPOSITE. 211 



standing the pure yellow rays, which also occur in E. peucepMlus. It can hardly pass 

 into h. ur/u-uleucus. ' "^ 



■1- -4- ■)- Dwarf, «-,|,it(,?e from a miilticipita] eaudex, with monocephalous flowerins stem= often 

 scapose: radicaHe«i-is<Ziss<;e<(r(/.- pappus simple. 



^ E. COmpositus, Pinsn. From hirsute to glahrate, with slender margined petiole seto<«- 

 ciliate: radical leaxes much crowded on the crowns of tlie eaudex, usuaUy 1-3-temately 

 parted mto linear or short and narrow spatulate lobes, the few on the erect flowering stems 

 3-lobed or entire aud linear : involucre (3 or 4 lines higli) sparselv birsute : ravs from 40 to 

 60, not very narrow, wbite, purple, or violet, mostly 3 or 4 lines long. — 1-1. ii. 53.5 ; F] Dan 

 xii. 1999 ; llooli. in Trans. Linn. Sue. xiv. 374, t. 13, & 1-1. ii. 17 ; DC. Prodr. v. -ixA ■ Torr. 

 & Gray, Fl. ii. 107. E. pedatuK, Xutt. Trans. Am. Phil. S.jc. vii. 308. C'nr-rarir, Lfvisli 

 Eicliards. in Frankl. Journ. App. ed. 2, 32. —Alpine and alpestrine districts of the Rocky 

 .Mountains, and of tlie .si.-ixa ^■e^ ada, from S. Colorado and California to Brit. Columbia and 

 arctic sea-coast. (Greenland aud Spitzbergen. ) 



Var. dlscoideus, Gkay. Kays wanting or abortive: head commonly smaller. 



Am. -Jour. Sci. ser. 2, xxxiii. 237 ; Eaton, Bot. King Exp. US. — (Same range as the radiate 

 form, often accom]>aiiying it; first cull, hy Purrij, &c. 



Var. trifldus, Gkav. Small blade of lea^■es simply 3-5-fid : the lobes from oblong to 



obovate. — Proc. Am. Acad. xvi. 90. E. trijUhts, Hook. Fl. ii. 17, t. 120. — Rocla- iloun- 

 tains, X. Colorado to Brit. Columbia; first coll. by l^ruwjflonrf, later h\ J. M. Cu'.ilter and 

 Catthy. 



. Var. pinnatisectus, Gray, 1. c. Usually a large form : numerous violet-purple 



ray.s 5 lines long: leaics pinnately parted into 9 to 11 linear and entire or rarely 2-3-cleft 

 t:ivision.s. — Mountains of Colorado, from South Park to the Sierra Blanca- first coU bv 

 HaU. 



•B. Pringlei, Gray. Smooth and glabrous, densely cespitose from a lignescent multicipital 

 eaudex: radical leaves laciniate-pinnatifid into 3 to 5 short-lanceolate or broadlv subulate 

 pointed lobes; those of the ascending {2 or 3 inches long) flowering stems linear, entire, 

 5 or 6 in number : involucre hardly 3 lines high, glabrous : rays 20 or 30, purple or whitish, 

 3 lines long. — Proc. Am. Acad. xvii. 210. — Cliffs of Mount AVrightson, Santa Pita Moun- 

 tains, iVrizoua, Pn'nr/le. 



H— •!—-)— -I— Dwarf or low specie-v alpine or alpestrine, entire-leaved, cespitose from multicipital 

 eaudex, no fine or cinereous pubescence, monocephalous : leaves few on the simple stems, at 

 least the radical broader than linear : rays rather numerous and not y^tv narrow : pappus simple 

 or nearly so. 



■H- Involucre glabrous but pruinose-glandular, brownish-purple: alpine and Aster-like, smooth 

 and green. 



B. leiomerilS. A span high from the somewhat surculose branches of the eaudex, smooth 

 and very glabrous (or some minute hairiness at least on the petioles) : leaves bright green, 

 mainly radical and spatulate, very obtuse (larger about inch long, Avitli tapering base or 

 petiole of at least equal length), from 2 to 6 lines wide; cauline only 2 or 3 and smaller : in- 

 volucre 3 lines high, not unlike that of E. salsiiglnusus, hut close, the bracts lanceolate and 

 not attenuate : rays about 40, linear, violet, 3 or 4 lines long. — Aster glacialis, Faton, B.jt. 

 King E.xp. 142, but hardly that of Xuttall (which is rather a high alpine form of A. sal- 

 siiji'mosus, to which this is related). Comes close to the next species, to which it has been 

 referred. — Rocky Mountains of Colorado, Utah, and Nevada, in the alpine region ; first coU. 

 by Parrij, Hall & Harbour, Watson. 



-H- -H- Involucre hirsute or pubescent, greenish : herbage not strigulose nor cinereous. 



- B. Ursinus, Eatox. a span or two high, loosely cespitose : leaves duller green, mostly 

 smooth and glabrous, hut their margins more or less liirsute-ciliate, spatulate to narrowly 

 ohlanceolate ; cauline ones lanceolate or linear and acute : involucre (3 lines high) aud naked 

 summit of flowering stem hirsute-pubescent : rays 40 or 50, purple, narrowly linear, 3 lines 

 long. — Bot. King Exp. 148 ; Gray, Bot. Calif, i. 327. — .Vlpine and subalpine region, Rocky 

 Jlountains, Wyoming to S. Colorado, Uinta 31ouutaius, Utah, and on ilount Dana, California; 

 first coll. by Watson. 



' B. radioatus, Hook. A span high or less, densely tufted : leaves all sfiatulate-linear or 

 scn;s'vhat wider (broadest ohly a line or two wide), hirsute or hirsutely ciliate, or sometimes 



