Family, Mustard. Stamens, 2. Pod, roundish, notched above, divided by a partition into 2 1-seeded cells, which are flattened at right angles to the partition. Leaves, thin, tapering at the base, upper lance-shaped, deeply toothed, the lower often cut. Flowers, very small, arranged in long racemes. Taste peppery. 2 feet high or less.