|Flowering Wisteria sinensis|
Wisteria (also spelled Wistaria or Wysteria) is a genus of flowering plants in the pea family, Fabaceae, that includes ten species of woody climbing bines native to the Eastern United States and to China, Korea, and Japan. Some species are popular ornamental plants, especially in China and Japan. An aquatic flowering plant with the common name wisteria or 'water wisteria' is in fact Hygrophila difformis, in the family Acanthaceae.
The botanist Thomas Nuttall said he named the genus Wisteria in memory of Dr. Caspar Wistar (1761–1818). Questioned about the spelling later, Nuttall said it was for "euphony", but his biographer speculated that it may have something to do with Nuttall's friend Charles Jones Wister, Sr., of Grumblethorpe, the grandson of the merchant John Wister. (Some Philadelphia sources state that the plant is named after Wister.) As the spelling is apparently deliberate, there is no justification for changing the genus name under the International Code of Botanical Nomenclature. However, some spell the plant's common name "wistaria".
- Wisteria brachybotrys Siebold & Zucc.
- Wisteria brevidentata Rehder
- Wisteria floribunda (Willd.) DC. – Japanese Wisteria
- Wisteria frutescens (L.) Poir. – American Wisteria
- Wisteria macrostachya (Torr. & Gray) Nutt. ex BL Robins. & Fern. – Kentucky Wisteria
- Wisteria sinensis (Sims) DC. – Chinese Wisteria
- Wisteria venusta Rehder & Wils. – Silky Wisteria
- Wisteria villosa Rehder
Wisteria vines climb by twining their stems either clockwise or counterclockwise round any available support. They can climb as high as 20 m above the ground and spread out 10 m laterally. The world's largest known Wisteria vine is in Sierra Madre, California, measuring more than 1 acre (0.40 ha) in size and weighing 250 tons, planted in 1894 of the Chinese lavender variety.
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, but 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 the seeds of that genus, are poisonous.
Wisteria, especially Wisteria sinensis, is very hardy and fast-growing. It can grow in fairly poor-quality soils, but prefers fertile, moist, well-drained soil. They thrive in full sun. Wisteria can be propagated via hardwood cutting, softwood cuttings, or seed. However, specimens grown from seed can take decades to bloom; for this reason, gardeners usually grow plants that have been started from rooted cuttings or grafted cultivars known to flower well. Another reason for failure to bloom can be excessive fertilizer (particularly nitrogen). Wisteria has nitrogen fixing capability (provided by Rhizobia bacteria in root nodules), and thus mature plants may benefit from added potassium and phosphate, but not nitrogen. Finally, wisteria can be reluctant to bloom because it has not reached maturity. Maturation may require only a few years, as in Kentucky Wisteria, or nearly twenty, as in Chinese Wisteria. Maturation can be forced by physically abusing the main trunk, root pruning, or drought stress.
Wisteria can grow into a mound when unsupported, but is at its best when allowed to clamber up a tree, pergola, wall, or other supporting structure. Whatever the case, the support must be very sturdy, because mature Wisteria can become immensely strong with heavy wrist-thick trunks and stems. These will certainly rend latticework, crush thin wooden posts, and can even strangle large trees. Wisteria allowed to grow on houses can cause damage to gutters, downspouts, and similar structures. Its pendulous racemes are best viewed from below.
Wisteria flowers develop in buds near the base of the previous year's growth, so pruning back side shoots to the basal few buds in early spring can enhance the visibility of the flowers. If it is desired to control the size of the plant, the side shoots can be shortened to between 20 and 40 cm long in mid summer, and back to 10 to 20 cm in the fall. Once the plant is a few years old, a relatively compact, free-flowering form can be achieved by pruning off the new tendrils three times during the growing season; in June, July and August, for the northen hemisphere. The flowers of some varieties are edible, and can even be used to make wine. Others are said to be toxic. Careful identification by an expert is strongly recommended before consuming this or any wild plant.
In culture 
Fuji Musumè (藤娘) or Wisteria Maiden is an Otsu-e (Japanese folk painting in Ōtsu, Shiga) subject thought to have been inspired by popular dances. These painting were often sold as good-luck charms for marriages. Fuji Musumè is also a famous classical Kabuki dance.
In Barbara Kingsolver's novel The Bean Trees, Turtle refers to wisteria vines as bean trees, because the pre-bloomed flower pods are shaped like beans. Later, she and Taylor learn that wisteria is a legume (i.e., is in the bean family) and that wisteria and other legumes engage in symbiotic relationships, just as the book's characters do.
See also 
|Wikimedia Commons has media related to: Wisteria|
- Nuttall, Thomas (1818). The Genera of North American Plants and a Catalogue of the Species, to the Year 1817 I. D. Heartt. p. 115. Retrieved 2011-05-15.
- Ohio State University, Wisteria. Accessed 2009.06.02.
- Graustein, Jeannette E. (1967). Thomas Nuttall, Naturalist: Explorations in America, 1808–1841. Harvard University Press. p. 123.
- Cotter, John L. Daniel Roberts, Michael Parrington. The Buried Past: An Archaeological History of Philadelphia (Philadelphia: University of Pennsylvania Press, 1994), 339. Edwin C. Jellett Germantown Old and New: Its Rare and Notable Plants, Germantown, PA: Germantown Independent Gazette 1904, 83.
- Charters, Michael L. "Page W". California Plant Names: Latin and Greek Meanings and Derivations. Retrieved 2011-05-15.
- Bryson, Bill (2003). "Ch. 6 — Science Red in Tooth and Claw". A Short History of Nearly Everything (1st ed.). New York, NY: Broadway Books. ISBN 0-375-43200-0.
- Dixon, Richard; Howard, Philip (June 5, 2009). "Wisteria? Wistaria? Let's call the whole thing off". The Times (London). Retrieved 2011-05-16.
- Hu, Jer-Ming; Lavin, Matt; Wojciechowski, Martin F.; Sanderson, Michael J. (2000). American Journal of Botany 87 (3): 418–30 http://www.amjbot.org/content/87/3/418.full.pdf
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- sierramadrechamber.com Wistaria
- sierramadrenews.net Wistaria
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