404 Karl M. Wiegand and Arthur J. Eames 



d. Heads smaller, the involucre 5 mm. high or less ; rays white or sometimes 

 tinged with blue. 

 c. Uppermost leaves and involucral bracts subulate, with rather thick 



pungent tips; foliage leaves linear. 14. A. ericoides 



e. Uppermost leaves and involucral bracts without thick subulate tips ; 

 foliage leaves various. 

 /. Corollas of the disk flowers goblet-shaped ; lobes of the corolla equaling or 

 exceeding the throat in length, those of the outer florets, at least, 

 generally recurved; rays 7-14. 15. A. laicriflorus 



f. Corollas of the disk flowers tubular-funnel-form; lobes of the corolla 

 shorter than the throat, erect or merely spreading; rays 14-50. 



16. A. paniculatus 

 c. Bracts of the involucre without green tips, the green or greenish midrib not 

 dilated toward the apex ; rays white or nearly so. 

 d. Plant tall, stiff, very leafy, with many closely corymbose heads ; involucre 



3-5 mm. long; pappus double. 17. A. umbellatus 



d. Plant low, zigzag, with scattered leaves and few loosely panicled or 

 corymbose heads; involucre 6-13 mm. long; pappus simple. 



18. A. acuminatus 



1. A. divaricatus L. (A. corymbosus of Cayuga Fl.) 



Dry woodlands and banks, except in the heavier soils; common. July 20-Sept. 15. 



S. Me. and w. Que. to Man., southw. to Ga. and Term. ; less abundant on the 

 Coastal Plain. 



Nearly all the plants are of the form termed by Burgess A. tenebrosus. Many 

 species belonging to this group of Asters have been described by Burgess, but this 

 and the two following are the only ones recognizable as species in this region. 



2. A. Schreberi Nees. 



Borders of dry woods, chiefly in clay; frequent. July 15-Sept, flowering earlier 

 than other species. 



Dry Run, Spencer; North Spencer; Six Mile Creek; Cascadilla Creek, toward 

 Dwyer Pond; woods e. of C. U. barns; Fall Creek, s. of Beebe Lake; near Republic 

 Inn and n. of railroad station, Freeville ; Paine Creek ; and elsewhere. 



N. E. to Mich., southw. to Va. ; rare or absent on the Coastal Plain. 



Having the appearance of a hybrid between A. divaricatus and A. macrophyllus, 

 which may be its true status. 



3. A. macrophyllus L. 



Woodlands and banks where not too dry, mostly in gravelly or sandy noncalcareous 

 loams ; common. Aug.-Sept. 20. 



Most abundant about woods of oak and chestnut on the more residual soils of the 

 higher hills of the basin, and on the shore of Cayuga Lake; rare in the McLean 

 region and on the clays and the richer heavier soils. 



N. B. to Minn., southw. to N. C. In the Cayuga Lake Basin the species is found 

 chiefly on the lighter soils, but it occurs only occasionally on the Coastal Plain. 



4. A. sagittifolius Wed. 



Dry fields and thickets, in clay, stonv clay, or clay loams ; locally common. Sept- 

 Nov. 



Local at mouth of Enfield Glen, and on South Hill s. of Coddington Road ; 

 abundant along the e. side of the lake from Cayuga Heights to Union Springs 

 (D. !) : n. of Newton Ponds. 



N. B. (?) and Vt. to N. Dak., southw. to Fla., Miss., and Okla. ; rare or absent 

 on the Coastal Plain. 



