Brassica rapa
"Brassica napus" grows to in height with hairless, fleshy, pinnatifid and glaucous lower leaves which are stalked whereas the upper leaves have no petioles. "Brassica napus" can be distinguished from "Brassica nigra" by the upper leaves which do not clasp the stem, and from "Brassica rapa" by its smaller petals which are less than across.