i i iMPOSITAE. 



Vol. III. 



70. 



Bog Aster. 



198. 1789. 

 Bull. Torr. Club 21 



Aster nemoralis Ait. 

 Fig- 4351- 



Aster nemoralis Ait. llort. Kew. 3: 

 Aster nemoralis Blakei Porter, 



.iii. 1894. 



Stem puberulent, slender, simple, or corym- 

 bosely branched above, 6'-2 high. Leaves ses- 

 sile, oblong-lanceolate or linear-oblong, acute at 

 each end, pubescent or puberulent on both sides, 

 dentate or entire, 1-3' long. iJ"-io" wide, mar- 

 gins often revolute; heads several, or solitary. 

 l'-li' broad, the peduncles slender; involucre 

 broadly obconic to hemispheric, its bracts ap- 

 pressed, linear-subulate, acute or acuminate, im- 

 bricated in about 3 series; rays 15-25, light 

 violet-purple to rose -pink; achenes glandular- 

 pubescent; pappus white. 



In sandy bogs, New Jersey to northern New 

 York, Ontario, Newfoundland and Hudson Bay. 

 Races differ in leaf-form and serration. Aug.-Sept. 



71. Aster acuminatus Michx. Whorled 

 or Mountain Aster. Fig. 4352. 



Aster div aricatus Lam. Encycl. 1 : 305. 1783. Not L. 



Aster acuminatus Michx. Fl. Bor. Am. 2: 109. 1803. 



Stem pubescent or puberulent, zigzag, corym- 

 bosely branched, often leafless below, 1-3 high. 

 Leaves thin, broadly oblong, acuminate at the 

 apex, narrowed to a somewhat cuneate sessile 

 .base, sharply and coarsely dentate, pinnately vein- 

 ed, glabrous or pubescent above, pubescent at 

 least on the veins beneath, 3'-6' long, l'-li' wide, 

 often approximate above, and appearing whorled ; 

 heads several or numerous, l'-li' broad; invo- 

 lucre nearly hemispheric, its bracts subulate- 

 linear, acuminate, the outer much shorter; rays 

 12-18, narrow, 6"-8" long, white or purplish; 

 pappus soft, fine, nearly white ; achenes pubescent. 



Moist woods, Labrador to Ontario, western New 

 York, and in the mountains to Tennessee and Geor- 

 gia. July-Oct. 



72. Aster ptarmicoides (NeesA T. & G. Upland White Aster. Fig. 4353- 



mont and Ontario to Saskatchewan, Illinois, Misso 



Chrysopsis alba Nutt. Gen. 2 : 152. 1818. Not 



A. albus Willd. 

 Doellingeria ptarmicoides Nees, Gen. & Sp. 



Ast. 183. 1832. 

 A. ptarmicoides T. & G. Fl. N. A. 2: 160. 



1841. 

 Unamia alba Rydb. Bull. Torr. Club 37: 



146. 1910. 



Stems tufted, slender, rigid, usually 

 rough above, corymbosely branched near 

 the summit, I-2 high. Leaves linear- 

 lanceolate. 1-3-ribbed. entire, or with a 

 few distant teeth, firm, shining, rough- 

 margined or ciliate, sometimes scabrous, 

 acute, narrowed to a sessile base, or the 

 lower petioled, the lowest and basal ones 

 3'-6' long, 2"-4" wide, the upper smaller, 

 those of the branches linear-subulate ; 

 heads 8"-l2" broad; involucre nearly 

 hemispheric. 2"-3" high, its bracts lin- 

 ear-oblong, obtuse, or the outer acutish, 

 appressed, nearly glabrous, green, im- 

 bricated in about 4 series; rays 10-20. 

 white, 3"-4" long ; pappus white ; achenes 

 glabrous. 



In dry or rocky soil, Massachusetts, Vcr- 

 uri and Colorado. July-Sept. 



