Brassica campestris, also known as field mustard, is a species of mustard plant commonly found in Asia and Europe. This plant has many synonyms, including Brassica rapa subsp. campestris, Brassica campestris subsp. napiformis, and Brassica campestris subsp. dichotoma. In the United States, it is also referred to as turnip rape, while in Japan, it is called kabu-nakina. Field mustard is an important crop for oil production and is commonly used as a green vegetable in Asian cuisines. It is also used as a cover crop to control soil erosion and improve soil quality. With its many synonyms, Brassica campestris has made a significant impact on agriculture and cuisine around the world.