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a genus of deciduous plants of the family Juglandaceae. The leaves are alternate and usually odd-pinnate; the flowers are unisexual and in catkins. The fruit is a drupe. There are ten species, distributed in Asia. One species, Pterocarya pterocarpa, is found in the USSR; it measures up to 35 m tall and up to 1.3 m in diameter. The species grows in forests of Transcauca-sian valleys together with alder, white beech, and several other types of trees. A moisture-loving and rapidly growing tree, it may live 200 years. The wood is white, light, friable, and not very sturdy. It is cultivated as an ornamental.