Stout, to 2 m, becoming tomentulose-canescent in the infl; principal lvs long-petioled, 1–2 dm, the upper reduced, with sheathing petioles; lfls oblong to elliptic, varying to lanceolate, 2–4 cm, obtuse, finely serrate; umbels 5–15 cm wide, rays 18–35; pedicels and ovary pubescent; fr oblong-elliptic, 4–7 mm, cordate at base, sparsely pubescent along the wingless dorsal ribs; lateral ribs winged; oil-tubes few; seed adherent to the pericarp; 2n=22. Dry woods and thickets; Mass. to Minn., s. to Fla., Miss., and Ark. July–Aug. (A. villosa Walter, not Lag.)
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