Currently, the word Watermelon is used to describe the fruit known as Citrullus Lanatus. It is, as Wikipedia describes it, "a plant species in the family Cucurbitaceae, a vine-like flowering plant originating in West Africa. It is a highly cultivated fruit worldwide, having more than 1000 varieties" As you would expect, this fruit has a high water content, of 92%. But, another fruit, in the melon, or Cucurbitaceae family, known as Cucumis sativus, or cucumber, actually has a higher water content, of 95%. The Cucumis sativus is described by Wikipedia as, "a widely cultivated plant in the gourd family, Cucurbitaceae [the same as the Citrullus Lanatus family]. It is a creeping vine that bears cuneiform fruits that are used as vegetables." Both fruits have a green outside, but inside of a Citrullus Lanatus is a red or pink opaque color when ripe, the Cucumis sativus on the other hand tends to be a clear or very light green color, more like that of true water. Due to the fact that what is known as cucumber is a melon, has a higher water content that the fruit known as the watermelon and appears more water-like. It makes sense that the cucumber should really be called a watermelon. Sign below to make sure that true watermelon gets its rightful name.