Watermelon, scientifically known as Citrullus lanatus, is a popular fruit known for its sweet, juicy flesh and refreshing taste.Shape, Typically round or oblong . Size, Varies widely, from small personal-sized melons to large ones weighing over 20 kg. Skin , Hard rind that is usually green with darker green stripes or variegation. Flesh , Most commonly red or pink, but can also be yellow or orange.