Cruciferae Brassica napiformis (Pail. & Bois) Bailey
Source: Magness et al. 1971
This mustard relative develops a tuberous root, in appearance much like a globular turnip. Roots reach a diameter of 3 to 4 inches, and are similar to turnips in appearance, texture, flavor and culture. It is rarely grown in the U.S. The root, leaves and petioles are edible.