Biennial (sometimes perennial?) 2-5 dm, the stem branched at base, often decumbent, thinly pubescent with mostly forked hairs; cauline lvs oblanceolate to oblong- obovate, 2-5 cm, even the uppermost usually sharply toothed, somewhat narrowed to the clasping base, pubescent with simple hairs above, with stellate ones beneath; pet white, a little exceeding the sep; pedicels at anthesis hirsute, at maturity 2-4 mm and usually glabrous; fr widely spreading, flat, 1.5-3 cm נ1 mm, often minutely hairy, the valves nerveless or 1-nerved near the base; seeds in 1 row, wingless. Rich moist woods; N.Y. to Minn., s. to Va. and Ark. Apr., May. (A. dentata)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.