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The watermelon (Citrullus lanatus var. lanatus, family Cucurbitaceae) is an annual scrambling and trailing vine. It has long, weak, trailing, or climbing stems that are five angles (five sided) and can grow up to 3m (10 ft) long. It has coarse, hairy pinnately-lobed leaves. Young growth is densely woolly with yellowish-brown hairs which disappear as the plant ages. It has coarse, hairy pinnately-lobed leaves that get stiff and rough when old. The leaves have flowers that grow singly in the leaf axils. The petals are white or yellow on this inside and greenish-yellow on the outside. These flowers are unisexual, which means that one plant can have male and female flowers(monoecious). The male flowers predominate at the beginning of the season; the female flowers, which develop later, have inferior ovaries. The styles are united into a single column. It is a berry with a hard rind and no internal division, botanically called a pepo. The rind (exocarp) is thick, is mid- to dark green and usually mottle or striped. The fleshy center (mesocarp and endocarp) has many pips all throughout it. The inside can have a variety of colors such as red or pink (most commonly), orange, yellow, green or white. If grown in the wild, the fruits grow to 20 cm (8 in) in diameter. Cultivated varieties can exceed 60 cm (24 in). Considerable breeding effort has been put into disease-resistant varieties and into developing a "seedless" strain with only digestible white seeds. Many cultivars are available that produce mature fruit within 100 days of planting the crop. The fruit can be eaten raw or pickled and the rind can be cooked.