It is an erect annual, 3 feet or more in height, with smaller flowers than the White Mustard. It has spear-shaped, upper leaves, linear, pointed, entire and smooth, and the shortly beaked pods. The seed coat is thin and brittle and covered with minute pits. This well known spice has its use in medicine as a stimulating external application. The rubefacient action causes a mild irritation to the skin, stimulating the circulation in that area and relieving muscular and skeletal pain.

Origin: Canada