The cultivars of B. oleracea are grouped by developmental form into seven major cultivar groups , of which the Acephala ( `` non-heading '' ) group remains most like the natural Wild Cabbage in appearance : For other edible plants in the family Brassicaceae , see cruciferous vegetables .
It is rich in essential nutrients including vitamin C . The cultivars of B. oleracea are grouped into seven major cultivar groups , of which the Acephala Group remains most like the natural wild cabbage in appearance : All are in the same species .