Mustard, Black

Brassica nigra
An upright, branched, sparsely hairy 2-6' plant. The 1/2-1/3" flowers are in terminal clusters and have 4 yellow petals. The slender 4-sided seedpods hug the stem and have a short beak tipped with a knob. The long-stalked, toothed lower leaves have large terminal lobes and 2-4 smaller lateral ones. The smaller upper leaves are nearly sessile and have smooth edges. Blooms June-October in fields, waste places.

Has been an important source of commercial mustard.