[2] It is the only species in the monotypic genus Hirschfeldia, which is closely related to Brassica.

[3] The species is native to the Mediterranean Basin but it can be found in many parts of the world as an introduced species and often a very abundant noxious weed.

[6] Its stem and foliage have soft white hairs.

Unlike black mustard, H. incana is a perennial plant.

[5] Its leaves are edible and traditionally were used in some areas as a leaf vegetable.