Solanum citrullifolium is a species of flowering plant in the Solanaceae family. It is a nightshade referred to by the common name watermelon nightshade, as its leaves somewhat resemble those of a watermelon plant. It is a white-stemmed shrub with purple star-shaped flowers. It is native to the southern United States and it is grown in home gardens as an ornamental plant.

Not to be confused with the similarly-named "melonleaf nightshade," which is a different species, S. heterodoxum.

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