Brassica rapa L. (syn. Brassica campestris L.), commonly known as turnip, turnip rape, fast plants, field mustard, or turnip mustard, is a plant widely cultivated as a leaf vegetable (see mizuna and napa cabbage), a root vegetable (see turnip), and an oilseed (but not normally rapeseed oil, from a different Brassica species).
The oilseeds known as canola are sometimes particular varieties of Brassica rapa (termed Polish Canola) but mostly the related species Brassica napus and Brassica juncea.