Biennial, 2-5 dm, glabrous to sparsely hairy; basal lvs persistent, dentate to pinnatifid; cauline lvs numerous (averaging 25 below the first fl), erect, lanceolate to linear, the lower commonly with a few sharp teeth, the upper mostly entire; pet creamy-white, 6-8 mm, nearly or fully twice as long as the sep; mature racemes lax and elongate, with ascending pedicels 5-10 mm; frs at first erect, becoming widely divergent and commonly arcuate, 5-9 cm נ1.2-2 mm, flat, the valves 1-nerved to or beyond the middle; seeds in 1 row, quadrate-oblong, 1.5-2 mm, conspicuously winged. Moist or dry, rocky or sandy woods and hills; Me. to N.Y. and N.J.; Ind., Wis., and Mich. to Mo., Ark. and Okla. May-July. (A. viridis)
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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