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There are five species of Corynocarpus, occurring in New Guinea, New Caledonia, Australia and New Zealand. The genus has been assigned to many different families, though the consensus now is to place it in its own family Corynocarpaceae, in the order Cucurbitales (Philipson 1987, Wagstaff & Dawson 2000, APG 2003). They are evergreen trees or shrubs with simple, leathery leaves, C. laevigatus being the only candidate for cultivation in temperate latitudes. The leaves are alternate or rarely in whorls, and glabrous, rarely spiny. The inflorescences are rather thick, stiff panicles in a terminal position. The flowers are regular, hermaphrodite and 5-merous. The petals and sepals are free, but imbricate, and there are five staminodes as well as five stamens. The fruit is a drupe and the seeds have no endosperm (Allan 1961, Guymer 1984).