Erigeron. COMPOSITE. 327 



leaves hirsutely ciliate below the middle, otherwise glabrous or glabrate, entire ; the 

 cauline linear or linear-lanceolate (l to 4 inches long, 1 to 3 lines wide), the 

 lowest linear-spatulate or oblanceolate and usually tapering into slender petioles : 

 heads peduncled and simply racemose, or rarely panicled : involucre 3 or 4 lines 

 long : rays more numerous than the disk-flowers, the purplish or whitish nearly 

 filiform ligules when fully developed projecting only one line beyond the pappus ; 

 disk-flowers uniform. Gray in Proc. Am. Acad. viii. 648. E. lonchophylium, 

 Hook., apparently a large form. E. glabratum, var. minor, Hook. E. racemosum, 

 or at least the var. angustifolium, Nutt. 



Saline gravel and moist meadows in the Sierra Nevada, at 6, 500 to 9, 700 feet, Brewer, Bolan- 

 der. Also on mountains east to Colorado, and thence northward. Rare in Siberia. 



E. ACRE, Linn., especially in smoother forms (E. Drobachcnsis, Mill., E. elongatus, Ledeb. 

 &c.), occurring in the Rocky Mountains from Colorado north, may be expected in the Sierra 

 Nevada. It may be known by its broader leaves, and an inner set of pistillate flowers with tubu- 

 lar-filiform corolla. There are none of these in E. armericefolium. 



* % Rays elongated and conspicuous, or wanting in some specimens. 

 -t- Leaves once to thrice ternately compound : pappus simple. 



2. E. compositum, Pursh. Dwarf : leaves all or mostly crowded on the ces- 

 pitose rootstocks, slender-petioled, hirsute ; their divisions linear, obtuse, spreading ; 

 the cauline (if any) simpler, or the uppermost mere linear bracts : scape an inch to a 

 span high, bearing a solitary proportionally large head (involucre 3 or 4 lines high) : 

 rays 30 to 50, violet, purple, or white, 2 or 3 lines long, occasionally none. 



High peaks of the Sierra Nevada, at 10,000 to 12,000 feet, on Mount Dana and Wood's Peak, 

 Brewer. Thence through the Rocky Mountains to Arctic America and Greenland. 



+- -t- Leaves entire and narrow, clustered on the rootstocks, fewer and scattered or 

 sometimes hardly any on the mostly simple stems, which are terminated by solitary 

 heads. (No. 5 and No. 8 have stems more leafy and disposed to branch.) 



3. E. ursinum, Eaton. Sparsely more or less hirsute, green, a span or less 

 high : leaves on the rootstock spatulate or linear-spatulate, tapering into a slender 

 petiole ; those of the simple scape-like flowering stems linear-lanceolate (6 to 18 

 lines long), glabrate, the uppermost remote from the solitary head : scales of the 

 involucre loose, glandular and sparsely hirsute : rays about 50, broadish, purple, 

 fully 3 lines long : pappus with a few distinct short bristles of an outer series. 

 Eaton in Bot. King Exp. 148. 



On Mount Dana, at 12,800 feet, Bolander. More dwarf than the plant collected by Watson 

 in the Uinta Mountains, Utah ; the scape less than 3 inches high. Perhaps this is E. radi- 

 catum, Hook. 



4. E. uniflorum, Linn. Green and slightly hirsute, or almost glabrous below, 

 a span or less in height : leaves of the rootstock tufted, spatulate, tapering into a 

 petiole ; those of the simple and sometimes scape-like stem becoming lanceolate : 

 scales of the involucre loose, equal, very hirsute- woolly : rays 100 or more, blue or 

 purple, about 4 lines long. Torr. & Gray, Fl. ii. 168. 



High Sierra Nevada, in Sierra Co., at 10,000 feet (Kellogg), thence northward along the high 

 mountains and through the Rocky Mountains to the Arctic regions, and in N. Asia and Europe. 

 A dwarf state, but otherwise like that of the Colorado mountains, with the copious and character- 

 istic long hairs of the involucre gray or whitish, not dark as in the more northern specimens. 



5. E. caespitosum, Xutt. More or less hoary with a fine chiefly spreading and 

 roughish pubescence : stems decumbent or ascending from the somewhat woody 

 rootstock, about a span high, mostly leafy : leaves from the rootstock oblanceolate, 

 tapering into a petiole, an inch or two long ; the cauline linear or somewhat lan- 

 ceolate and sessile, obtuse : heads solitary (or sometimes two or three and rather 

 small), short-peduncled : involucre hirsute with short hairs : rays 30 to 50, white 



