Similar to no. 41 [Aster macrophyllus L.]but eglandular, with merely puberulent infl and normally with white rays; basal lvs tending to have a rectangular sinus; invol 5-10 mm, often very narrow, its bracts avg narrower than in no. 41 and sometimes a little loose, those of the inner row much the longest; rays 6-14; 2n=54. Woods; N.H. and se. Me. to Del. and Va., w. to O. and W.Va., and irregularly to Tenn., Ala., Ill., and e. Wis. (A. chasei; A. curvescens; A. glomeratus) The midwestern plants (A. chasei G. N. Jones) may be alloploidsof nos. 41 and 44 [Aster furcatus Burgess], whereas the more eastern ones (A. schreberi proper) may be alloploids of nos. 41 [Aster macrophyllus L.] and 43 [Aster divaricatus L.]
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.