A slender lax plant from N.B., N.S., and P.E.I., differs from no. 16 [Aster lateriflorus (L.) Britton] in its delicately open-paniculate infl, with not at all secund branches, and often larger heads, the invol to 6.5 mm. It is perhaps better subordinated to A. lateriflorus as var. tenuipes Wiegand.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.