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The citron melon, which grows in southern Africa, is one popular candidate for the watermelon’s ancient ancestor.

The fruit, sometimes called monkey-bread, is about the size of a citron melon.

The fruits are grapes, hazel, walnut, almond, pistachio, currant, mulberry, fig, apricot, peach, apple, pear, quince, plum, lemon, citron, melon, berries of various kinds, and a few oranges.

By crossing the watermelon on the citron melon, a watermelon that is resistant to wilt has recently been developed and successfully grown in soils in which wilt is present.