(A. curtisii Torr. & A. Gray), known from the Blue Ridge Province of N.C., S.C., Ga., and Tenn., may be expected in s. Va. It will key to A. novi-belgii, from which it differs most notably in that the green tip of the invol bracts is subtruncate at the base.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.