Food feed
One species
Broccoli, cabbage, kale, and cauliflower are commonly classified as Brassica oleracea, despite looking like very different vegetables. Selection emphasized different parts of the same basic plant.
Berry
Bananas are botanical berries, while strawberries are aggregate accessory fruits. The distinction depends on how a flower becomes a fruit, not on sweetness, size or the name on a grocery label.
Legume
Peanuts are legumes, in the same plant family as peas and beans, rather than true botanical nuts. Their unusual feature is that the flowers develop above ground but the pods mature below it.