Glabrous or sparsely glandular biennial or short-lived perennial to 1 m; lvs oblong, acuminate, the lower to 2 dm, ±pinnatifid or coarsely dentate, often with 2 large salient teeth near the base, the upper lvs progressively reduced, none clasping; mature pedicels to 10-15 mm; pet 4-8 mm; fr obliquely ovoid, 5-10 mm, coarsely and irregularly verrucose; 2n=14. Native of s. Europe, becoming established as a weed here and there in our range. May-July.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.