Assorted vegetables. Basket of cruciferous vegetables. The vegetables are cauliflower (white, upper left), cabbage (pale green, centre), broccoli (dark green florets, upper right) and brussels sprouts (lower right). These vegetables are closely related, all being from the Brassica species of the Cruciferae family. These vegetables are all a good source of vitamin C, folic acid (a B vitamin) and the essential mineral potassium.