Vernicia fordii (Tung Tree; syn. Aleurites fordii Hemsl.) is a species of Vernicia in the spurge family, native to southern China, Burma, and northern Vietnam. Other vernacular names include Tung Oil Tree, Tung-oil Tree, Tungoil Tree, China Wood-Oil Tree, Kalo Nut Tree, 油桐 (lit. oil tung) being the formal name in Chinese.
It is a small to medium-sized deciduous tree growing to 20 m tall, with a spreading crown. The bark is smooth and thin, and bleeds latex if cut. The leaves are alternate, simple, 4.5–25 cm long and 3.5–22 cm broad, heart-shaped or with three shallow, maple-like lobes, green above and below, red conspicuous glands at the base of the leaf, and with a 5.5–26 cm long petiole. The flowers are 2.5–3.5 cm diameter, with five pale pink to purple petals with streaks of darker red or purple in the throat; it is monoecious with individual flowers either male or female, but produced together in the inflorescences. The flowers appear before or with the leaves in loose, terminal clusters. The fruit is a hard, woody pear-shaped drupe 4–6 cm long and 3–5 cm diameter, containing four or five large, oily seeds; it is green initially, becoming dull brown when ripe in autumn.
It has been introduced to Argentina, Paraguay, Thailand, and the United States for oil production. Just prior to World War I, a number of seeds received from the U.S. Ambassador to China were planted in California, but the young trees could not take hold in the dry climate. It has been planted more successfully in the U.S. Gulf States from Florida west to eastern Texas. In 1969, many of the trees were wiped out by Hurricane Camille, and the plantations never recovered. It has escaped from cultivation in some areas, and is now listed as an invasive species in Florida.
Global production of the fruit has risen from just over 100,000 tonnes in 1970 to almost 200,000 tonnes by 1980. Fruit yields are typically in the range of 4.5–5 tonnes per hectare. A number of cultivars have been selected for increased yield and small tree size, including 'Folsom', 'Cahl', 'Isabel', 'La Crosser', and 'Lampton'.
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