coMPOsiTAB .(composite familv) 517 



28< Aster Nelsonii Greene^ 1. c. -Stems slender, wiry, 4-8 dm. high, from 

 branching and only superficially seated subhgneous rootstocks, simple, leafy 

 throughout and racemosely or subcorymbosely floriferous above the middle: 

 cauline leaves 5-8 cm. long, firm, narrowly hnear, entire, acute, sessile and 

 half-clasping, 1-nerved, glabrous on both faces, the margin scabrellous: in- 

 volucres i broadly turbinate, 6-8 mm. high; bracts imbricated in; about 3 

 series, the short outermost often wholly herbaceous, oblong and obtuse, the 

 others successively narrower and I lanceolate or linear, acute, pubescent on 

 the- back and marginally ciliate, mostly weU differentiated into lanceolate 

 green,' tip and margmally colorless! linear base: rays about 20, violet or paler, 

 rather narrow and inconspicuous.-— Frequent on moist banks; Wyoming and 

 Colbrado. . ' 



_ 29. Aster adscendens Lindl. Hook. FI. Bor. Am. 2: 8. 1834. Stem slender, 

 rigid, glabrous or sparingly hirsute-pubescent, branched _or simple, 2-5 ,dm. 

 high: leaves firm, entire, rough-margined, sometimes ciliolate; those of the 

 stem lineaivlanceolate or linear-oblong, acute or obtusish, 2^7 cm. long, 

 4-10 mm. -wide, sessile by a more or less clasping base; basal leaves spatulate, 

 narrowed intd short petioles: heads not numerous, about 25 mm. broad;, in- 

 volucre hemispheric; the ' bracts imbricated in 3-5 series, oblong-Unear or 

 spatulate, the tips usually Obtuse or obtusish, ' slightly spreading, the inner 

 nrfteii iliucronulatej pappus I'nearly white; achenes pubescent. {A. Nvttallii 

 Tl ■& G.;i A. dermdatvs.iiutt.; A. orthophyll'Os Greetie, Leaflets 1: 146. 1905; 

 A. pratindold Greene, Pitt. 4: 215.'il900; A. vaUicoUi Greene, 1. c. 213; A. 

 Underwoodii,: A. Twe^yi, A. griseolus, A. corynibiformis Rydb. Bull. Torr. 

 Bot. Club 31: 653^5. 1904; A. subracemosus Eydb. Mem. N. Y. Bot. Gard. 

 1: 394. 1900.)^-Quite variable; throughout our range and northwestward. 



29a.' Aster adscendens armeriaefolius (Greene) A. Nels. Resembhng the - 

 species but the heads usually- few; the branches and branchlets slender above 

 and with; greatly- reduced leaves. (A. armeriaefolius Greene,. Pitt. ■4:: 214. 

 1900.) — In the mountains of Colorado. ; i, 



-30. Aster longifolius Lam. Encyel.'l: 306. 1783.' Stems glabrous or some- 

 what pubescent, leafy, paniculately branched, 3^9 dm. high: leaves lanceolate 

 to linear4anceol£ite, entire or nearly so, acuminate, narrowed into a sessile, 

 clasping, .usually slightly cordate base, 7-20 cm. long, 4-12 mm. wide: heads 

 rather numercnis, about 25 mm. broad; involucre hemispheric, 8-10 mm. high; 

 the bracts glabrous, narrow, green, acute, imbricated in only 1 or 2 series, 

 nearly equal: rays numerous, about 8 mm. long, violet or pale purple: pappus 

 pale. {A. lonchophyllus Greene^ Lea&eta 1: 146. 1905.)-— Colorado to Mon- 

 tana and-thence to ^New England. - ( ■ 



31. Aster Fremontii T. & G. Gray, Syn. Fl. 1: 191. 1884; Stems slender, 

 erect, 2-5 dm.iMgh, glabrous or the upper parts soft^pubescent: leaves thin- 

 nish, the margins- either quite naked and slnOoth or obscurely ciliolate- 

 scabrousj the radical and lowest caiihne oblong or oblanceolate, or somewhat 

 obovate,! 3-7i cm. long, tapering into a slender-^marginedl petiole;, the cauline 

 oblong-lanceolate to linear, commonly half-clasping at base: heads solitary 

 in the smaller speciinens, several in the larger, 8-12 .mm. high, somewhat 

 naked-pedunculate; bracts of the involucre narrowly linear, obtuse, or the 

 inner -acute, some of the outer shorter,, all loose and siuiilar: rays numerous, 

 8-42 mm. long. — Wet moimtain mead.ows; in our range and to the north- 

 westward. 



.»i*82i' Aster Canbyi Vasey, Gray, Syn. Fl. 1: 185. 1884. Stems rather stout, 

 simple or branched above, leafy to the tbp, 2-6 dm. high: leaves thickish, 

 ample; the upper cauUne mostly oblong, and with broadly, half-clasping, usually 

 auriculate insertion: heads jS^lit^ry, sevecal or many,_ large or smaller as the 

 number increases; bracts oblong or spatulate, acute or obtuse, the outer 

 usually shorter, or sometimes more foliaceous and then equaling the disk. 

 [A. Burkei (Gray) Howell, Fl. 310. 1897; A, majitscdus Greene, Pitt. 4: 215. 

 1900; A. spathulatiu Lindl. (A. subspathvlatus Tlydb. Mem. N. Y.' Bot. Gard. 

 1: 395. 1900); A. ciliomarginattis Rydb. 1. c. 392; A. CvMckii Gray, as to our 

 rangej]-^In the mountains; New Mexico to Montana, Utah, and Washington. 



