Cabbage, cauliflower, broccoli all come from a mustard plant
A wild mustard plant 'Brassica oleracea' is the parent species of vegetables including cabbage, cauliflower, broccoli, and brussels sprouts. The plant has been selectively bred over hundreds of years to create the variety, scientists said. Cauliflower and broccoli were derived from flower buds, cabbage and brussels sprouts from leaf buds, while other vegetables originated from the stem and leaves.