374 



COMPOSITAE. 



[Vol. III. 



Aster Radula Ait. Low Rough Aster. File-blade Aster. (Fig. 3783.) 



Aster Radula Ait. Ilort. Kew. 3: 210. 1789. 



Stem glabrous, or puberulent above, slen- 

 der, corymbosely branched near the summit, 

 i°-2° high. Leaves sessile, rough above, 

 more or less pubescent beneath, oblong- 

 lanceolate, acute, sharply serrate, strong!}' 

 pinnately veined, 2'-3' long, 3"-i2" wide; 

 heads several , or sometim es numerous, i '-i |^ ' 

 broad; involucre hemispheric, its bracts ob- 

 long or obloug-spatulate, coriaceous, ap- 

 pressed-pubescent, conspicuously ciliolate, 

 their green obtuse tips appressed; rays 20- 

 30, violet, 4"-6" long; acheucs glabrous, 

 striate; pappus nearly white. 



In swamps, IH-lawart and southern Pennsyl- 

 vania to Newfoundland. July-Sept. 



Aster Hadula biflorus (Michx.) Porter, Mem. 



Terr. Club. 5: 326. 1894. 



Asler biJlorus'i,l\<:\\x. FI. Bor. Am. 2: 114. 1S03. 



Aster slriclus Pursh. Fl. Am. Sept. 556. 1814. 



Aster Radula var. striclus A. Gray. Syn. Fl. i: 



Part 2, 176. 1884. 



Lower, very slender; heads 1-3; leaves narrower, less serrate or entire; involucralbracts.orsomeof 

 them acute. Mountains of New England to Labrador and Newfoundland. Perhaps a distinct species. 



50. Aster Herveyi A. Gray. Hervey's Aster. (Fig. 3784.) 



Aster Herveyi S.. Gray, JIan. Ed. 5, 229. 1867. 



Stem roughish, at least above, slender, sim- 

 ple orcorymbosely branched, rarely paniculate, 

 I°-3° high, the branches glandular-puberulent. 

 Leaves firm, rough above, pubescent on the 

 veins beneath, the basal aud lower ones on 

 slender naked petioles, ovate, dentate with low 

 usually distant teeth, acute at the apex, nar- 

 rowed, rounded or rarely cordate at the base, 

 2'-6' long, i'-3' wide; upper leaves sessile, or 

 narrowed into winged petioles, smaller, entire 

 or nearly so; heads I'-lji' broad; involucre 

 turbinate or campauulate, its bracts appressed, 

 or sometimes spreading, densely glandular, ob- 

 long or spatulate, obtu.se or mucronulate; rays 

 15-25, violet, 5"-7" long; achenes minutely 

 pubescent, striate; pappus nearly white. 



In dry soil, eastern Massachusetts and Rhode 

 Island, .\pparently hybridizes with A. specta- 

 bilis. Aug.- Oct. 



51. Aster turbinellus LindL Prairie 

 Aster. (Fig. 3785.) 



Aster turbinellus Lindl. Conip. Bot. Mag. i: 98. 



1835- 



Stem slender, paniculately branched, glabrous 

 below, puberulent above, 2°-3° high. Leaves 

 firm, lanceolate, or oblong-lanceolate, entire, 

 ciliate, acute or acuminate, 2'-3' long, the 

 lower and basal ones petiolcd, the upper ses- 

 sile, those of the branches much smaller; 

 heads about i' broad, mostly solitary at the 

 ends of the branches; involucre turbinate, its 

 bracts oblong, coriaceous, obtuse, appressed, 

 imbricated in 5 or 6 series, their tips green only 

 at the apex; rays 10-20, 3"-5" long, violet; 

 pappus tawny; achenes finely pubescent. 



In drj- soil, especially on prairies, Illinois to Mis- 

 souri, Kansas, Louisiana and .Arkansas. Sept. -Oct. 



