Similar to no. 16 [Aster lateriflorus (L.) Britton], but with long, creeping rhizomes, and often verging toward no. 12 in habit; stem uniformly spreading-puberulent, at least above; lvs uniformly (sometimes sparsely) puberulent beneath, or sometimes more densely so and almost villous along the midrib, more scabrous or subglabrous above; invol glabrous or sometimes puberulent; lobes of the disk-cors comprising 45-65% of the limb; 2n=32, 48. River bottom-lands; n. N.Y. to Ky., Tenn., and n. Miss., w. to Minn., S.D., and Okla. (A. missouriensis, a preoccupied name)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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