Similar to no. 22 [Aster parviceps (Burgess) Mack. & Bush], but glabrous throughout, and more slender, wiry, and diffuse, only 1-4 dm, all the cauline lvs (except the numerous, much reduced, subulate ones of the infl) generally deciduous by anthesis; heads 16-32-fld, the rays 9-16, from 2 fewer to 3 more than the disk-fls; 2n=16. On serpentine in se. Pa. and adj. Md.; reputedly disjunct on diabase in Granville Co., N.C.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.