Brassica juncea (L.) Czern.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Glabrous, often glaucous annual 3–10 dm; lower lvs to 2 dm, pinnatifid and dentate, the upper progressively reduced, short-petioled or sessile; fls 12–15 mm wide; mature pedicels ascending, 10–15 mm; frs ascending, subterete, 1.5–4 cm; seeds 2 mm, conspicuously and evenly reticulate; 2n=36. Native of Asia, established as a weed throughout our range and w. to the Pacific. June–Oct.
brown mustard, Chinese mustard, Indian mustard