Has been reported from N.S. It is coarser than A. microcarpa, to 30 cm, with blades to 1 cm, the lobes of the stipules triangular, about half as long as the undivided part, the fruiting hypanthium 2+ mm, and the sep somewhat spreading; 2n=48.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.