The water melon (Citrullus lanatus) is a plant species in the family Cucurbitaceae, a vine-like (scrambler and trailer) flowering plant originally from Africa. It is cultivated for its fruit. The subdivision of this species into two varieties, watermelons (Citrullus lanatus (Thunb.) var. lanatus) and citron melons (Citrullus lanatus var. citroides (L. H. Bailey) Mansf.), originated with the erroneous synonymization of Citrullus lanatus (Thunb.) Matsum. & Nakai and Citrullus vulgaris Schrad. by L.H. Bailey in 1930. Molecular data including sequences from the original collection of Thunberg and other relevant type material, show that the sweet watermelon (Citrullus vulgaris Schrad.) and the bitter wooly melon Citrullus lanatus (Thunb.) Matsum. & Nakai are not closely related to each other. Since 1930, thousands of papers have misapplied the name Citrullus lanatus (Thunb.) Matsum. & Nakai for the watermelon, and a proposal to conserve the name with this meaning was accepted by the relevant nomenclatural committee and confirmed at the International Botanical Congress in Shenzhen.
The species was long thought to have originated in southern Africa, but this was based on the erroneous synonymization by L. H. Bailey (1930) of a South African species with the cultivated watermelon . The error became apparent with DNA comparison of material of the cultivated watermelon seen and named by Linnaeus and the holotype of the South African species. There is evidence from seeds in Pharaoh tombs of watermelon cultivation in Ancient Egypt.
The watermelons's skin is green in colour. The sweet, juicy flesh of the watermelon is usually deep red to pink (thought sometimes yellow), with many black seeds, although seedless varieties have been cultivated. The fruit can be eaten raw or pickled and the rind is edible after cooking.
The flower of a watermelon is yellow-coloured.
In 2016, global production of watermelons was 117 million tonnes, with China alone accounting for 68% of the total. Secondary producers with more than 1% of world production included Turkey, Iran, Brazil, Uzbekistan, Algeria, the United States, Russia, Egypt, Mexico, and Kazakhstan.