318 COMPOSITE ERIGERON 



single heads : leaves narrowly linear, elongated, entire, attenuate at the 

 base, the lowermost tapering into a slender petiole : heads 5-6 lines in 

 diameter: bracts of the involucre linear, very acute, densely hirsute: rays 

 numerous, 6 lines long, white to purple. Arid plains between the Cascade 

 and Kocky mountains, British Columbia to California and New Mexico. 



-M- -M- Tufted, stems very short and densely leafy, bearing 

 simple and monocephalous scapiform or few-leaved flowering stems: 

 leaves narrowly spatulate-linear: heads large: rays 25-50 not very 

 narrow, 3-4 lines long. 



E. Poliospernins Gray Syn. Fl. i, Pt. 2, 210. Soft-hispid throughout 

 with white hairs: stems numerous, from a branched rootstock, an inch or 

 le c s long, very leafy: leaves spatulate to lanceolate, 2-6 lines long, on 

 slender petioles 1-2 inches long : scapose peduncle 2-4 inches long : heads 

 half-inch or more in diameter: bracts of the involucre cetaceous, densely 

 hispidulous: rays 20-30, blue- violet to almost white: achenes densely 

 white-villous : outer pappus slender-squammellate, fully as long as the 

 breadth of the achene covered by the copious white silky hairs of the 

 achene. On dry rocky ridges along the Columbia riv c r from The Dalles 

 eastward. 



E. Chrysopsidis Gray 1. c. Chrysopsis hirtella DC, Hirsute with 

 white spreading hairs, stems scape-like, leafy at the base, 2-4 inches high: 

 leaves spatu ate, mostly obtuse, including the petiole 1-3 inches long, 

 usually about a line wide at the summit: heads solitary, terminal: in- 

 volucre open-companulate, its bracts narrow, numerous 3-5 lines long, 

 hirsute : rays, 4J-50, golden yellow, 6-8 lines long : achenes barely pubes- 

 cent or hirsutulous : outer pappus merely setulose. On high stony ridges, 

 Eastern Oregon in the John D?y country. 



+. h_ h_ Dwarf, cespitose from a multicipital candex, with 

 monocephalous flowering stems, often scapose : radical leaves dissected : 

 pappus simple. 



E. compositxis Pu*sh Fl. ii, 535. Herbage hirsute to glabrate and 

 more or less viscidulous : stems very short, from a somewhat woody creep- 

 ing base, densely leafy : leaves fan-shaped in outline, usually 1-3-ternately 

 parted into linear or short and narrow spatulate lobes, 2-6 lines long, on 

 Jong slender hispid-ciliate petioes; the few on the erect flowing stems 3- 

 lobed, or entire and linear : involucre 8-4 lines high, sparsely hirsute : rays 

 40-60 not very narrow, white purple or violet mostly 3-4 lines long. On 

 cliffs, Artie seacoast, Greenland, and Spitzbergen to the higher moun- 

 tains of Washington, Oregon and California and the Rocky mountains. 



Var. discoideus Gray, Am. Jour Sci. Ser. 2, xxxi'i, 237. Rays want- 

 ing or abortive: heada commonly smaller. Some range as the radiate 

 form, often growing with it. 



_,_ +_ +. +. Dwarf or low species, alpine or alpestine, entire- 

 leaved, cespitose from multicipital caudex, no fine or cinereous 

 pubescence, monocephalous: leaves few on the simple stem at least 

 the radical broader than linear: rays rather numerous and not very 

 narrow : pappus simple or nearly so. 



•m- Involucre hirsute or pubescent, greenish : herbage not strigulose 

 nor cinereous. 



E. radicatus Hook. Fl. ii, 17. "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 almost naked, then 

 glabrous; no glandular roughness: involucre more or less villous-pubes- 

 cent (barely 3 lines high) : rays white or purplish, 2 or 3 lines long.'' Al- 



