Ericjeron. C0MP0SIT^5. 327 



loavps hirsutoly ciliatc liolow tlio luiddlo, otliorwiso glabrous or ^lahrato,, entire ; the 

 cauline linear or linear-lanceolate (1^ to 4 inclms lon^f, 1 to 3 lines wide), tlie 

 lowest linear-spatulate or oblailceolate and nsually ta|)ering into slender j)etiolo.s : 

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

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

 liliform ligules wdien fully developed projecting only one line beyond the pappus"; 

 disk-dowers uniform. — (Jray in Proc Am. Acad. viii. (548. E. Innchopkyllum, 

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

 or at least the var. nngnMifolinm, Nutt. 



Saline gravol ami moist meadows in tlie Sierra Nevada, at 6,500 to 0,700 feet, Brewer, Bolan- 

 der. Also on mountains cast to Colorado, and thence northward. Kare in Siberia. 



E. ACiiK, Linn., especially in smoother forms {/?. l)robachcnsL% Mill., E. elonqaliis, Ledeb. 

 &c.), occurring in the Hocky Mountains from Colorado north, may be exi)ectcd 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. crmcrucfoliiun. 



* -^ Rays elongated and consjncAious, or wanting in some sjiecimens. 

 +- Leaves once to thrice ternatebj compound : 2^'^'ppiif simple. 



2. E. compositum, I^irsh. Dwarf: loaves all or mostly crowded on the cos- 

 pitose rootstoeks, slentlor-petiolcd, 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. Thenco through tlio Rocky Mountains to Arctic America and Greenland. 



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

 sometimes hardly any on the mostly simple stems, tvhich 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-spatidate, tapering into a slender 

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

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

 invoIu(n'<i loose, glandidar and fiparsely hirsul(< : rays about 50, broadish, purple, 

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

 Eaton in JJot. King Ji^xp. 148. 



On Mount Dana, at 12,800 feot, Bolander. More dwnif than tlio plant collected by Watson 

 in the Uinta Mountains, Utah ; the scapo less than 3 inches high, rciimps tliis is E. radi- 

 calum, 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. & Oray, Tl. ii. 108. 



High Sierra Nevada, in Sierra Co., at 10,000 feet (AV//077), thence northward along the high 

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

 A dwarf state, but otherwise like that of the Colorado mountains, with the conious and ehnractcr- 

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



5. E. caespitosum, Nutt. 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 objnnceolate, 

 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 tlirco and rather 

 small), siiort-poduncled : involucre hii*sute with short hairs : rays 30 to 50, whito 



