GENUS 31. THISTLE FAMILY. 421 
37- Aster janceus Ait. Rush Aster. 
Fig. 4318. 
Aster junceus Ait. Hort. Kew. 3: 204. 17809. 
eid a lg Sheldon, Bull. Geol. Surv. Minn. g: 18, 
pl. 2. 1894. 
Aster junciformis Rydb. Bull. Torr. Club 37: 142. 1910. 
Stem very slender, glabrous, or pubescent above, 
simple or little branched, 1°-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, 13-4” 
wide; heads paniculate, rather distant, about 1’ 
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 adscéndens 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, 1’-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 1’ 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- 
Descent. 
On prairies and moist banks, western Nebraska to 
Wyoming, Montana, Assiniboia, Colorado, New Mex- 
ico and Nevada. July—Sept. 
39. Aster novi-bélgii L. New York Aster. Fig. 4320. 
Aster novi-belgii L. Sp. Pl. 877. 1753. 
Aster novi-belgii elodes A. Gray, Syn. Fl. 17: 190. 1884. 
Aster novi-belgit litoreus A. Gray, loc. cit. 189. 1884. 
Aster novi-belgii atlanticus Burgess; Britt. & Brown, 
Ill. Fl. 3: 370. 1898. 
Aster novi-belgii Brittonii Burgess, loc. cit. 371. 1898. 
Stem slender, usually much branched, glabrous, or 
slightly pubescent above, 1°-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 I5- 
25, violet, 4”-5” long; pappus whitish; achenes gla- 
brous or nearly so. 
