The Probert Encyclopaedia of Nature

BLACK MUSTARD

Black mustard (Brassica nigra) is an erect, branching cruciferous annual with slender stems. The lower leaves are bristly, pinnately cut, the terminal lobe much larger than the others. The flowers are small and yellow and carried at the stem-tips. The fruit is a small, very slender, beaked siliquae pressed against the stems.
Research Black Mustard