Black mustard (Brassica nigra)

Black mustard (*Brassica nigra*) is an annual plant originating from North Africa, Europe, and Asia. It thrives in both tropical and temperate climates. This species is notable for its elongated seed pods, which house four black seeds each. These seeds are commonly used as a spice to produce mustard. In regions like the West Coast of the United States, black mustard is regarded as an invasive weed.