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Wisteria is a genus of about ten species of woody climbing vines native to the eastern United States and the East Asian states of China, Korea, and Japan. Aquarists refer to the species Hygrophila difformis, in the genus Hygrophila, as water Wisteria.

Wisteria vines climb by twining their stems either clockwise or counter-clockwise round any available support. They can climb as high as 20 m above ground and spread out 10 m laterally. The world's largest known Wisteria vine is located in Sierra Madre, California, measuring more than an acre in size and weighing 250 tons.

The leaves are alternate, 15 to 35 cm long, pinnate, with 9 to 19 leaflets. The flowers are produced in pendulous racemes 10 to 80 cm long, similar to those of the genus Laburnum, but are purple, violet, pink or white, not yellow. Flowering is in the spring (just before or as the leaves open) in some Asian species, and in mid to late summer in the American species and W. japonica. The flowers of some species are fragrant, most notably Chinese Wisteria. The seeds are produced in pods similar to those of laburnum, and, like that genus, are poisonous.

The genus was named after Dr. Caspar Wistar (1761 - 1818), a professor of anatomy at the University of Pennsylvania. As a consequence, the name is sometimes given as "Wistaria", but the spelling Wisteria is conserved under the International Code of Botanical Nomenclature.

Wisteria species are used as food plants by the larvae of some Lepidoptera species including brown-tail. It is also an extremely popular ornament in China and Japan.