Species doesn't mean as much in the plant world. Cabbage, broccoli, cauliflower, kale, Brussels sprouts, collard greens, kohlrabi, and gai lan are all Brassica oleracea. You can have specimens that are even technically the same cultivar but wildly different alimentary character.
Hooray!! I totally love the way 'Brassica' vegetables provide such a vivid illustration of the amazing variety that some selection-pressure can yield on the development of essentially a single type of input organism. Makes you wonder what might happen when these types of selection-pressures start affecting humankind more!
