GENUS 31. 



THISTLE FAMILY. 



421 



37. Aster junceus Ait. Rush Aster. 

 Fig. 4318. 



Aster junceus Ait. Hort. Kew. 3 : 204. 1789. 



Aster longulus Sheldon, Bull. Geol. Surv. Minn. 9: 18, 



pi. 2. 1894. 

 Aster junciformis Rydb. Bull. Torr. Club 37: 142. 1910. 



Stem very slender, glabrous, or pubescent above, 

 simple or little branched, i-3 high. Leaves firm, 

 glabrous, roughish-margined, narrowly linear, entire 

 or sometimes with a few distant teeth, acute or 

 acuminate at the apex, sessile by a broad clasping 

 and often slightly cordate base, 3'-6' long, i*"-4" 

 wide; heads paniculate, rather distant, about i' 

 broad; involucre hemispheric, about 3" high, its 

 bracts glabrous, linear-subulate, very acute, imbri- 

 cated in 3 or 4 series, the outer shorter; rays violet 

 to white, 4"-5" long; pappus pale. 



In swamps and bogs, Nova Scotia to British Columbia, 

 New Jersey, Ohio, Wisconsin and Colorado. July-Sept. 



38. Aster adscendens Lindl. Western 

 Aster. Fig. 4319. 



A. adscendens Lindl. ; Hook. Fl. Bor. Am. 2 : 8. 1834. 

 Stem slender, rigid, glabrous, or sparingly 

 hirsute-pubescent, branched or simple, 6'-2 high. 

 Leaves firm* entire, rough-margined, sometimes 

 ciliolate, those of the stem linear-lanceolate or 

 linear-oblong, acute or obtusish, i'-3' long, 2"-5" 

 wide, sessile by a more or less clasping base; 

 basal leaves spatulate, narrowed into short peti- 

 oles; heads not numerous, about i' broad; invo- 

 lucre hemispheric, its bracts imbricated in 3-5 

 series, oblong-linear or spatulate, their tips obtuse 

 or obtusish, slightly spreading, the inner often 

 mucronulate; pappus nearly white; achenes pu- 

 bescent. 



On prairies and moist banks, western Nebraska to 

 Wyoming, Montana, Assiniboia, Colorado, New Mex- 

 ico and Nevada. July-Sept. 



39. Aster novi-belgii L. New York Aster. Fig. 4320. 



Aster novi-belgii L. Sp. PI. 877. 1753. 

 Aster novi-belgii elodes A. Gray, Syn. Fl. I 2 : 190. 1884. 

 Aster novi-belgii litoreus A. Gray, loc. cit. 189. 1884. 

 Aster novi-belgii atlanticus Burgess ; Britt. & Brown, 



111. Fl. 3: 370. 1898. 

 Aster novi-belgii Brittonii Burgess, loc. cit. 371. 1898. 



Stem slender, usually much branched, glabrous, or 

 slightly pubescent above, i-3 high. Leaves lanceo- 

 late, oblong-lanceolate, or linear-lanceolate, firm, 

 often somewhat fleshy, entire, or slightly serrate, 

 glabrous, or very nearly so, acuminate at the apex, 

 narrowed, sessile and more or less clasping at the 

 base, 2'-6' long, 3"-8" wide, the lowest petioled ; 

 heads corymbose-paniculate, usually numerous, 10"- 

 15" broad; involucre hemispheric to campanulate, 

 its bracts linear, acute, or obtusish, green, somewhat 

 spreading, in 3-5 series, the outer shorter; rays 15- 

 25, violet, 4"-S" long ; pappus whitish ; achenes gla- 

 brous or nearly so. 



