ISO GAMOPETALOUS EXOGEN* 



sparingly serrate. Beads of flowers paniculate ; scales of the involucre with a 



white membranaceous margin, minutely ciliate. 



Bab. Swampy thickets, and low grounds: frequent. Fl. Sept. JV..Octo. 



13. A. prenantllOicIes, Muhl. Hairy in lin.es ; corymbose- 

 paniculate; leaves spatulate-lanceolate, auriculate-clasping, in- 

 eised-serrate in the middle; scales of the involucre linear and 

 squarrose. 



PRENANTHES-LIKE ASTER, 



Stem 2 to 4 or 5 feet high, smoothish, or sometimes muricately scabrous, often 

 purple, the branches conspicuously hairy in lines. Leaves 2 or 3 to 6 or 8 inches 

 long, with an entire acumination, contracted and entire below the middle, dilated 

 and auriculate at base. Heads of flowers often numerous, in a spreading corym- 

 bose panicle; rays pale violet-purple, or lilac, sometimes nearly white; akenes 

 cuneate-oblong, nerved, hairy, yellowish. 

 Hob. Moist, shaded grounds; Brandy wine: frequent. Fl. Sept. Fr. Octo. 



Obs. This is generally a well-marked species, but some forms of 

 it approach pretty near to the preceding. 



14. A. Wovae-Angliae, L. Hirsute; stout; corymbose at 

 summit ; leaves linear-lanceolate, entire, auriculate-clasping ; scales 

 of the involucre foliaceous, lance-linear, loosely spreading. 

 NEW-ENGLAND ASTER. 



Stem 3 to 5 or 6 feet high, scabrous, mostly dark purple, often numerous from 

 the same root. Leaves 1 to 2 or 3 inches long, tapering nearly from base to apex, 

 numerous, the upper ones mostly purplish, Heads of flowers racemose-corymbose, 

 numerous, showy; involucre and p&'uncles glandular-pubescent, somewhat viscid, 

 often dark purple ; rays bright purple with a tinge of violet ; dislc yellow ; akenes 

 hirsute; receptacle alveolate, the pits with dentate margins. 

 Hah. Low grounds; Great Valley: rare. Fl. Sept. Fr. Octo. 



Obs. This is, perhaps, the handsomest of our native Asters, and 

 is frequently cultivated for its showy autumnal flowers. 



193. ERI'C^EROtf , L. 



[Gr. Er, spring, and Geron, an old man ; the plant being hoary in spring.] 

 Meads many-flowered; rays numerous, in more than one series, very 

 narrow. Involucre mostly hemispherical; scales narrow, nearly 

 equal, and almost in a single row. Receptacle punctate. Akenes 

 compressed, 2-nerved, pubescent; pappus a single row of capillary 

 rough bristles, and often, with an outer row of short bristles, or 

 chaffy scales. Leaves alternate, generally sessile ; heads paniculate, 

 or corymbose, sometimes small ; rays white, or purplish. 



f Pappus single. * Rays inconspicuous, white. 



1. E. Canadense, L. Stem hirsute, paniculately branching ; 

 leaves lance-linear, mostly entire; heads small, numerous, race- 

 mose-paniculate. 

 CANADIAN ERIGERON. Horse-weed. Butter-weed. 



Annual. Stem 6 inches to 5 or 6 feet high. Leaves 1 to 3 or 4 inches long, hairy 

 and ciliate, the lower ones sparingly dentate. Heads of flowers loosely racemos* 

 on the branches: rays capillary, scarcely longer than the straw-colored pappus; 

 akenes sparsely hairy. 

 Sab. Fields, and roadsides : every where common. FL Aug. Fr. Sept. 



