Coronopus didymus (L.) Sm.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Foetid annual or biennial, thinly hairy, much-branched, spreading or ascending, 1–4 dm; lvs oblong, 1–3 cm (including the short petiole), pinnatifid, the segments entire or with a few deep teeth; racemes rather loose, 1–3 cm, the mature pedicels slender, 2 mm; fr didymous, distended over the seeds, coarsely wrinkled on the surface, 1.7–3 mm, cordate at base, evidently notched at summit, the style and stigma included in the notch; 2n=32. Native of S. Amer., established as a weed throughout our range and elsewhere, especially southward. Summer. (Carara d.)