Erujeron. COMPOSITiE. 



327 



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

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

 lowest linear-spatulate or ol)lanceolate 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 

 hhform ligules when fully developed projecting only one line beyond the pai^nis • 

 disk-flowers uniform. — Gray in Proc. Am. Acad. viii. 048. E. louchophi/Uum 

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

 or at least the var. aiigustifotium, Nutt. ' 



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

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



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

 &c.), occurring in the liocky 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 flowere with tubu- 

 iar-faliform corolla. There are none of these in E. armericcfolium. 



* * Rays elongated and consjncuous, or wanting in some specimens. 

 ■+- Leaves once to thrice ternatehj compound : p)(^^PV'U'S simple. 

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

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

 the cauline (if any) simpler, or tlie 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- -f- Leaves entire and narrow, clustered on the rootstocks, fewer and scattered or 

 sometimes hardly any on the mostly simp)le stems, ivhich 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 scapedike flowering stems lineardanceolate (G to IS 

 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 Pot. King Exp. 148. 



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

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

 catum, Hook. 



4. E. uniflorum, Linn. Green and slightly liirsute, 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. 1G8. 



High Sierra Nevada, in Sierra Co., at 10,000 feet {Kellogg), thence northward along the hin-h 

 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 coi)ious and character- 

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



5. E. CSBSpitOSum, ISTutt. 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 ratlier 

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



