200 COMPOSITiE. ^ster. 



Var. ledophtllus, Gkat. Stem lower (not over 2 feet high), rather strict : leaves 

 smaller (inch or two long), cottony-tomentulose beneath, at least when young ; lower obtuse and 

 merely mncronate, uppermost with slender cuspidate point usually developed. — Proc. Am. 

 Acad. viii. 388. A. ledophijllus, Gray, Proc. Am. Acad. xvi. 98, without char. — Mount 

 Hood at 4,000 feet and upward, Hall, Howell, Mount Paddo (Adams), Suksdorf. Seemingly 

 distinct, hut passes into the type and into the following variety. 



Var. glauoesoens. Stem mostly slender, 1 to 3 feet high, in the larger plants 



more branched above and hearing rather numerous corymhosely disposed heads: leaves 

 somewhat glaucous, wholly glabrous (except the minute ciliolation of the species), lanceo- 

 late, 2 or 3 inches long, 3 to 7 Unes wide, uppermost usually attenuate-cuspidate : heads 

 smaller or less broad : involucre of fewer and closer bracts. — Washington Terr. ; on Mount 

 Paddo, and Sincoe Mountains, Suksdorf, Howell. N. California, mountains of Siskiyou 

 Co., Greene, Priiii/le, distributed as A. elegans, which it approaches. 

 A. elegans, Tore. & Geay. Slender, 1 to 3 feet high, mostly scabro-puberulent : leaves 

 thicldsh, pale, lanceolate (inch or two long), erect, the upper apiculate-mucronate, the veins 

 inconspicuous : heads several at summit of simple stem or branches, comparatively small 

 and few-flowered (4 or 5 lines high) : involucral bracts all close and conspicuously woolly- 

 ciliate, barely acute, outer ovate, none with pointed tips : rays rather few, about 4 lines long : 

 style-appendages linear-subulate, hardly acute. — Fl. ii. 159 ; Eaton, 1. c. (a somewhat ambig- 

 uous form). Evcephalus elec/ans, Nutt. Trans. Am. Phil. Soc. vii. 298. — Jlountains of 

 Wyoming and Montana to N. Nevada and E. Oregon ; first coU. by Nuttall. 



-i— ■<— Style-appendages obtuse and short-oblong, shorter than the stigmatic portion: involucral 



bracts fiiir.er; all the outer obtuse, not ciliate nor scarious-margined : akenes narrower, merely 



pubescent. 



A. glaucus, Tore. & Geay. Throughout smooth and glabrous, glaucescent or pale: stems 



a foot high from extensively creeping filiform rootstocks, lirancliing, bearing several or 



numerous paniculate heads : leaves thicldsh, lanceolate (1 to 3 inches long, a quarter to half 



inch broad), rather obtuse, when dry reticulate-venulose both sides: involucre 3 lines high, 



imbricated in about 3 ranks : rays bright violet, 4 to 6 lines long. — El. ii. 150 ; Eaton, 1. c. 



Eucephalus (Lagatea) glaucus, Nutt. I.e. — Rocky Mountains, Wyoming to Colorado and 



Utah. 



* * * * Involucre less imbricated, hemispherical; the bracts in few ranks and in the typical 

 species somewhat equal, pai'tly greenish, with or witliout scavious margins : pappus-bi'istles not 

 clavellate-thickened at tip : low-stemmed or acaulescent, from a thick and sometimes ligneous 

 caudex or rootstock, with solitary or few pedunculate heads, and rather large and numerous 

 I'ays : leaves thickisli, jiarrow, one-nerved or nervose, entire. — Xi/lnrrl/h't, Nutt. Trans. -Vm. 

 Phil. Soc. vli. 298. § Orthomeris, XylorrUza, Torr. & Gray, 1. c. : also Benth. & Hook. Gen. 

 ii. 273, excl. syn. Rhlnacthia (which has a double pappus) & Arctngeron (Avliich lias the char- 

 acters of Erigeron with somewhat too imbricated involucre). Western montane species. 



•i— Genuine species, Avith comparatively large (half-inch high or more) and shoiv}- heads, and 

 thickish leaves : pappus-bristles rattier rigid. 



++ Heads terminating short leafy stems which arise from creeping and ligneous rootstocks : invo- 

 lucral bracts acuminate and mucronate-tipped : style-appendages triangular- or lanceolate-subu- 

 late, notattenuate, shorter than the stigmatic portion : akenes oblong, vcin- villous. — Xijlorrltiza, 

 Nutt. 



A. Parryi, Gray. Tomentose-puhescent and cinereous, a span high : leaves mostly spatulate 

 and obtuse with a mucronate point, an inch or more long : heads usually solitary on peduncle 

 surpassing the leaves, very broad: l)racts of the involucre oblong-lanceolate, densely cine- 

 reous-pubescent : rays white, over half-inch long. — Am. Nat. viii. 212. — Rocky Jlountains 

 in Wyoming, on marsliy flats of Sandy Creek, Green River, &c., Parry, A. J. ilrCosh. 



A. Xylorrhiza, Tore. & Gray. Less pubescent and glabrate, 4 to 8 inches high : leaves 

 from narrowly spatulate-lanceolate to linear (1 or 2 inches long, 1 to 3 linos wide) ; the upper 

 commonly equalling the 1 to 3 pednncles : heads smaller : involucral bracts more ;ittcnu.ate : 

 rays "y.iV: red" or "]ialo rose-color," 1 lines long. — Xiilorrhizn riliosa & \. glabriiiscnla, 

 Nutt. Trans. Am. Phil. Soc. n. ser. vii. 297, 298. Astrr Xglorrhna & A. glahriiisnihis, Torr. 

 & firay, 1. e. 15S ; the latter a more lealy-stemmed form. — Clayey soil and on rocks, liocl^y 

 Mountains of Wyoming, toward the sources of the Platte; first coll. by Nullall. Laramie 

 Plains, Parry. 



