Erigeron. COMPOSITES. 211 



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

 into E. ockroleucus. 



--)--{- Dwarf, cespitose from a multieipital caudex, with nionocephalous flowering stems, often 

 scapose : radical leaves dissected: pappus simple. 



E. compositus, PL-RSH. From hirsute to glabrate, with slender margined petiole setose- 

 ciliate: radical leaves much crowded on the crowns of the caudex, usually 1-3-ternately 

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

 3-lobed or entire and linear: involucre (3 or 4 lines high) sparsely hirsute: rays from 40 to 

 CO, not very narrow, white, purple, or violet, mostly 3 or 4 lines long. Fl. ii. 535 ; Fl. Dan. 

 xii. 1099; Hook, in Trans. Linn. Soc. xiv. 374, t. 13, & Fl. ii. 17 ; DC. Prodr. v. 288; Torr. 

 & Gray, Fl. ii. 167. E. pedatus, Nutt. Trans. Am. Phil. Soc. vii. 308. Cineraria Lewisii, 

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

 Mountains, and of the Sierra Nevada, from S. Colorado and California to Brit. Columbia and 

 arctic sea-coast. (Greenland and Spitzbergen.) 



Var. discoideus, GRAY. Rays wanting or abortive : head commonly smaller. 



Am. Jour. Sci. ser. 2, xxxiii. 237; Eaton, Bot. King Exp. 148. Same range as the radiate 

 form, often accompanying it; first coll. by Parry, &c. 



Var. trifidus, GRAY. Small blade of leaves simply 3-5-fid : the lobes from oblong to 

 obovate. Proc. Am. Acad. xvi. 90. E. trijidus, Hook. Fl. ii. 17, t. 120. Rocky Moun- 

 tains, K Colorado to Brit. Columbia; first coll. by Drummond, later by J. M. Coulter and 

 Canby. 



Var. pinnatisectus, GRAY, I.e. Usually a large form: numerous violet-purple 

 rays 5 lines long : leaves pinuately parted into 9 to 1 1 linear and entire or rarely 2-3-deft 

 divisions. Mountains of Colorado, from South Park to the Sierra Blauca ; first coll bv 

 Hall. 



E. Pringlei, GRAY. Smooth and glabrous, densely cespitose from a lignescent multieipital 

 caudex : radical leaves laciniate-piuuatifid into 3 to 5 short-lanceolate or broadly subulate 

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

 5 or C 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 Wrightson, Santa Rita Moun- 

 tains, Arizona, Prhigle. 



H H H -t Dwarf or low species, alpine or alpestrine, entire-leaved, cespitose from multieipital 

 caudex, no fine or cinereous pubescence, nionocephalous : leaves few on the simple stems, at 

 least the radical broader than linear : rays rather numerous and not very narrow : pappus simple 

 or nearly so. 



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

 and green. 



E. leiomerus. A span high from the somewhat surculose branches of the caudex, 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, with tapering base or 

 petiule 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. salsuginosus, but close, the bracts lanceolate and 

 not attenuate : rays about 40, linear, violet, 3 or 4 lines long. Aster glacialis, Eaton, Bot. 

 King Exp. 142, but hardly that of Nuttall (which is rather a high alpine form of A. sal- 

 suginosus, 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 coll. 

 by Parry, Hall & Harbour, Watson. 



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



E. ursinus, EATON. A span or two high, loosely cespitose: leaves duller green, mostly 

 smooth and glabrous, but their margins more or less hirsute-ciliate, spatulate to narrowly 

 oblanceolate ; cauline ones lanceolate or linear and acute : involucre (3 lines high) and 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. Alpine and subalpine region, Rocky 

 Mountains. Wyoming to S. Colorado, Uinta Mountains, Utah, and on Mount Dana, California; 

 first coll. by Watson. 



E. radicatus, HOOK. A span high or less, densely tufted : leaves all spatulate-linear or 

 somewhat wider (broadest only a line or two wide), hirsute or hirsutely ciliate, or sometimes 



