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Watermelon is a scrambling and trailing vine in the flowering plant family Cucurbitaceae. The species originated in southern Africa with evidence of its cultivation in Ancient Egypt. It is grown in tropical and subtropical areas worldwide for its large edible fruit also known as a watermelon which is a special kind of berry with a hard rind and no internal division botanically called a pepo. The sweet juicy flesh is usually deep red to pink 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.
Considerable breeding effort has been put into disease-resistant varieties. Many cultivars are available that produce mature fruit within 100 days of planting the crop.
The watermelon is a large annual plant with long weak trailing or climbing stems which are five-angled (five-sided) and up to 3 m (10 ft) long. Young growth is densely woolly with yellowish-brown hairs which disappear as the plant ages. The leaves are large coarse hairy pinnately-lobed and alternate they get stiff and rough when old. The plant has branching tendrils. The white to yellow flowers grow singly in the leaf axils and the corolla is white or yellow inside and greenish-yellow on the outside. The flowers are unisexual with male and female flowers occurring on the same plant. 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. The large fruit is a kind of modified berry called a pepo with a thick rind and fleshy center. Wild plants have fruits up to 20 cm in diameter while cultivated varieties may exceed 60 cm. The rind of the fruit is mid- to dark green and usually mottled or striped and the flesh containing numerous pips spread throughout the inside can be red or pink orange yellow green or white.
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