COMPOSITAE. 



[Vol. III. 



Aster paniculatus aciitidens Burgess. 

 Aster carneus var. ambiguus T. & G. Fl. N. A. 2: 133. 



1841. tioi A. ambiguus Thyxnh. 1832. 



Leaves oblong-lanceolate, the larger often 6' long by 

 I '4 ' wide, very sharply serrate,at least above the middle ; 

 branches often very short, sometimes elongated, .\long 

 streams and ditches, Connecticut to Virginia, Ohio and 

 Kansas. 



60. Aster Missouriensis Britton. 

 Missouri Aster. (Fig. 3794. ) 



Stem densely puberulent or pubescent, at least 

 above, much brauchcd, 2° hifjh or more. I.eaves 

 thin, obloug-lanceolatc to oblanceolate, acute or 

 acuminate at the apex, sharply serrate above the 

 middle, gradually tapering to au entire sessile or 

 slightl)' clasping base, or the lower petioled, puber- 

 ulent above, finely pubescent beneath, the larger 

 3' -4' long, the upper much smaller, entire; heads 

 6"-S" broad, pauicled, short-peduncled, or termi- 

 nating short leafy brauchlets, sometimes somewhat 

 secund; involucre 2"-3" high, itsllnear acute bracts 

 well imbricated, ciliate or pubesceut; rays white. 



In moist soil, Kansas and Missouri. Sept. -Oct. 



61. Aster Tradescanti L. Tradescant's 

 Aster. Michaelmas Daisy. (Fig. 3795.) 



As/cr Tradescanti L. Sp. PI. 876. 1753. 



Stem slender, paniculately branched, 2°-5° 

 high, the branches usually ascending and often 

 pubescent in lines. Stem leaves linear-lanceo- 

 late or lanceolate, acuminate at the apex, nar- 

 rowed to a sessile base, 3'-6' long, i|i"-6" 

 wide, glabrous or nearly so on both sides, com- 

 monly thin, sharply serrate in the middle with 

 low teeth, or sometimes entire; heads very 

 numerous, racemose but not secund on the 

 branches, 5"-.'^" broad; involucre hemispheric 

 to broadly turbinate, 2"-3" high, its bracts 

 linear, acute, appresscd, green-tipped, imbri- 

 cated in 4 or 5 series; rays white or nearly so, 

 numerous, 2"-3" long; pappus white; achenes 

 minutely pubescent. 



In fields and swamps, Ontario to Virginia, west to 

 the Northwest Territory, Illinois and Minnesota, 

 Extends to Florida? Aug.-Oct. 



62. 



Aster Faxoni Porter. Faxon's 

 Aster. (Fig. 3796.) 



Aster polypliyllus Willd. Enum. 888. 1809. Not 



Moench, 1802. 

 Aster Faxoni Porter, Mem. Torr. Club, 5: 323. 1S94. 



Glabrous throughout; stem paniculately or cor- 

 ymbosely branched; rather stout, 2°-^° high. Stem 

 leaves lanceolate or linear-lanceolate, acute or 

 acuminate, narrowed to a sessile base, or the lower 

 into margined petioles, entire or nearly so, firm, 

 2'-5' long, 2"-4" wide, those of the branches grad- 

 ually smaller; basal leaves oblong to spatulate, ob- 

 tuse, dentate, heads not very nunierous,6"-9" broad; 

 involucre hemispheric, nearly 4" high, its bracts 

 linear-lanceolate, acute or subulate, green-tipped or 

 green on the back, imbricated in about 3 series, the 

 outer shorter; rays bright white, 3"-4" long, numer- 

 ous; pappus white; achenes minutely pubescent. 



On moist clifl's. Vermont and Massachusetts to Penn- 

 sylvania, west to Wisconsin!?) south to North Carolina 

 I according to Gray 1. Aug. -Sept. 



