Wisteria

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Wisteria
Chinese Wisteria Blutentrauben.JPG
Flowering Wisteria sinensis
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Tribe: Wisterieae
Genus: Wisteria
Nutt. (1818), nom. cons.
Synonyms [1]
  • BradburiaSpreng. (1826)
  • DiplonyxRaf. (1817), nom. rej.
  • KraunhiaRaf. (1891), nom. superfl.
  • PhaseoloidesDuhamel (1755), nom. rej.
  • RehsoniaStritch (1984)
  • ThyrsanthusElliott (1818), nom. illeg.
  • WistariaNutt. ex Spreng. (1826), orth. var.

Wisteria is a genus of flowering plants in the legume family, Fabaceae (Leguminosae). The genus includes four species of woody twining vines that are native to China, Japan, Korea, Vietnam, southern Canada, the Eastern United States, and north of Iran. They were later introduced to France, Germany and various other countries in Europe. Some species are popular ornamental plants. The genus name is also used as the English name, and may then be spelt 'wistaria'. [2] [3] In some countries in Western and Central Europe, Wisteria is also known by a variant spelling of the genus in which species were formerly placed, Glycine . Examples include the French glycines, the German Glyzinie, and the Polish glicynia.[ citation needed ]

Contents

The aquatic flowering plant commonly called wisteria or 'water wisteria' is Hygrophila difformis , in the family Acanthaceae.

Description

Seeds and seedpods of Wisteria floribunda (Japanese wisteria). The seeds of all Wisteria species contain high levels of the wisterin toxin and are especially poisonous. Wisteria floribunda MHNT.BOT.2008.1.38.jpg
Seeds and seedpods of Wisteria floribunda (Japanese wisteria). The seeds of all Wisteria species contain high levels of the wisterin toxin and are especially poisonous.

Wisterias climb by twining their stems around any available support. W. floribunda (Japanese wisteria) twines clockwise when viewed from above, while W. sinensis (Chinese wisteria) twines counterclockwise. This is an aid in identifying the two most common species of wisteria. [4] They can climb as high as 20 m (66 ft) above the ground and spread out 10 m (33 ft) laterally. The world's largest known wisteria is the Sierra Madre Wisteria in Sierra Madre, California, measuring more than 1 acre (0.40 ha) in size and weighing 250 tons. Planted in 1894, it is of the 'Chinese lavender' variety. [5]

The leaves are alternate, 15 to 35 cm long, pinnate, with 9 to 19 leaflets.

The flowers have drooping racemes that vary in length from species to species. W. frutescens (American wisteria) has the shortest racemes, 5–7 centimetres (2.0–2.8 in). W. floribunda (Japanese wisteria) has the longest racemes, 90 centimetres (35 in) in some varieties and 120 centimetres (47 in) or 200 centimetres (79 in) in some cultivars. [6] [7] [8] The flowers come in a variety of colors, including white, lilac, purple, and pink, and some W. brachybotrys (Silky wisteria) and W. floribunda cultivars have particularly remarkable colors. [9] [7] The flowers are fragrant, and especially cultivars of W. brachybotrys, W. floribunda, and W. sinensis are noted for their sweet and musky scents. [10] [7] Flowering is in spring (just before or as the leaves open) in some Asian species, and in mid to late summer in the American species.

Taxonomy

The genus Wisteria was established by Thomas Nuttall in 1818. [11] He based the genus on Wisteria frutescens , previously included in the genus Glycine . Nuttall stated that he named the genus in memory of the American physician and anatomist Caspar Wistar (1761–1818). [12] Both men were living in Philadelphia at the time, where Wistar was a professor in the School of Medicine at the University of Pennsylvania. [13] 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. [14] Various sources assert that the naming occurred in Philadelphia. [15] [16] It has been suggested that the Portuguese botanist and geologist José Francisco Corrêa da Serra, who lived in Philadelphia beginning in 1812, four years before his appointment as ambassador of Portugal to the United States, and a friend of Wistar, proposed the name "Wistaria" in his obituary of Wistar. [17]

As the spelling is apparently deliberate, there is no justification for changing the genus name under the International Code of Nomenclature for algae, fungi, and plants. [18]

Classification

The genus was previously placed in the tribe Millettieae. Molecular phylogenetic studies from 2000 onwards showed that Wisteria, along with other genera such as Callerya and Afgekia , were related and quite distinct from other members of the Millettieae. [19] [20] A more detailed study in 2019 reached the same conclusion, and moved Wisteria to the expanded tribe Wisterieae. [21]

Species

W. floribunda at Ashikaga Flower Park (ja) in Ashikaga, Tochigi
, Japan. The largest wisteria in Japan, it is dated to c. 1870 and covered approximately 1,990 square metres (21,400 sq ft) as of May 2008
. Zu Li noTeng  (Wisteria trellises in Ashikaga) 29 Apr, 2009 - panoramio.jpg
W. floribunda at Ashikaga Flower Park (ja) in Ashikaga, Tochigi , Japan. The largest wisteria in Japan, it is dated to c.1870 and covered approximately 1,990 square metres (21,400 sq ft)as of May 2008.

As of September 2023, Plants of the World Online accepted four species: [1]

ImageScientific nameCommon NameDistribution
Wisteria brachybotrys 03.jpg Wisteria brachybotrys Siebold & Zucc. (syn. Wisteria venustaRehder & Wils. [22] [23] )Silky wisteriaJapan
20130514Wisteria floribunda7.jpg Wisteria floribunda (Willd.) DC. Japanese wisteriaJapan
Wisteria frutescens flower closeup.jpg Wisteria frutescens (L.) Poir. (syn. Wisteria macrostachys)American wisteriaUnited States (Iowa, Michigan, and New York)
Wisteria sinensis 5Dsr 0101.jpg Wisteria sinensis (Sims) DC.Chinese wisteriaChina (Guangxi, Guizhou, Hebei, Henan, Hubei, Shaanxi, and Yunnan.)

Ecology

Wisteria species are used as food plants by the larvae of some Lepidoptera species including brown-tail moth.[ citation needed ]

Toxicity

The seeds are produced in pods similar to those of Laburnum, and, like the seeds of that genus, are poisonous. All parts of the plant contain a saponin called wisterin, which is toxic if ingested, and may cause dizziness, confusion, speech problems, nausea, vomiting, stomach pains, diarrhea and collapse. [24] [25] There is debate over whether the concentration outside of the seeds is sufficient to cause poisoning. Wisteria seeds have caused poisoning in children and pets of many countries, producing mild to severe gastroenteritis and other effects. [26] [25] [27]

Cultivation

Wisteria at Nymans Gardens, West Sussex, England May 2006.JPG
Wisteria at Nymans Gardens
(West Sussex, England)
Climbing wisteria (Stresa, Italy).jpg
Trunk of mature wisteria supported by balustrade (Stresa, Italy)

In North America, W. floribunda (Japanese wisteria) and W. sinensis (Chinese wisteria) are far more popular than other species for their abundance of flowers, clusters of large flowers, variety of flower colors, and fragrance. [7] W. sinensis was brought to the United States for horticultural purposes in 1816, while W. floribunda was introduced around 1830. [28] Because of their hardiness and tendency to escape cultivation, these non-native wisterias are considered invasive species in many parts of the U.S., especially the Southeast, due to their ability to overtake and choke out other native plant species. [28]

W. floribunda (Japanese wisteria), which has the longest racemes of wisteria species, is decorative and has given rise to many cultivars that have won the prestigious Award of Garden Merit. [7] [29]

Wisteria, especially W. sinensis (Chinese wisteria), is very hardy and fast-growing. It can grow in fairly poor-quality soils, but prefers fertile, moist, well-drained soil. It thrives in full sun. It 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.[ citation needed ]

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 before it has reached maturity. Maturation may require only a few years, as in W. macrostachya (Kentucky wisteria), or nearly twenty, as in W. sinensis. 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. W. floribunda (Japanese wisteria) with longer racemes is the best choice to grow along a pergola. W. sinensis (Chinese wisteria) with shorter racemes is the best choice for growing along a wall. [7] Whatever the case, the support must be very sturdy, because mature wisteria can become immensely strong with heavy wrist-thick trunks and stems. These can collapse latticework, crush thin wooden posts, and even strangle large trees. Wisteria allowed to grow on houses can cause damage to gutters, downspouts, and similar structures. 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 midsummer, and back to 10 to 20 centimetres (3.9 to 7.9 in) 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 the summer months. The flowers of some varieties are edible, and can even be used to make wine. Others are said to be toxic.[ citation needed ] Careful identification by an expert is strongly recommended before consuming this or any wild plant.

In the United Kingdom, the national collection of wisteria is held by Chris Lane at the Witch Hazel Nursery in Newington, near Sittingbourne in Kent. [30]

Art and symbolism

Sagari fuji mon (Wisteria mon) Sagari Fuji (No background and Black color drawing).svg
Sagari fuji mon (Wisteria mon )

Wisteria and their racemes have been widely used in Japan throughout the centuries and were a popular symbol in mon (family crests) and heraldry. [31] Wisteria is one of the five most commonly used motifs in the mon, and there are more than 150 types of wisteria mon. Because of its longevity and fertility, wisteria was considered an auspicious plant and was favored as a mon, and was adopted and popularized by the Fujiwara clan as their mon. [32] [33]

At the Metropolitan Museum of Art, New York 2017 04 - View of Oyster Bay. New York City.jpg
Bairei kacho gafu, Spring 12, Japanese wisteria and white-bellied green pigeons.jpg
Left to right: View of Oyster Bay (1908), by Louis C. Tiffany, with wisteria evoking the estate of its patrons, Wistariahurst; Japanese wisteria and white-bellied green pigeons (1883), a woodblock print by Kōno Bairei

One popular dance in kabuki known as the Fuji Musume (or 'The Wisteria Maiden'), is the sole extant dance of a series of five personifying dances in which a maiden becomes the embodiment of the spirit of wisteria. In the West, both in building materials such as tile, as well as stained glass, wisterias have been used both in realism and stylistically in artistic works and industrial design. [34]

Related Research Articles

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Wisteria floribunda, common name Japanese wisteria, is a species of flowering plant in the family Fabaceae, native to Japan. Growing to 9 m (30 ft), Wisteria floribunda is a woody, deciduous twining climber. It was first brought from Japan to the United States in the 1830s. It is a common subject for bonsai, along with Wisteria sinensis.

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<span class="mw-page-title-main">Sierra Madre Wistaria</span> Giant flowing vine in California. Largest single flowing plant

Sierra Madre Wisteria or The Wistaria Vine is a flowering Wisteria vine shown at the annual Wistaria Festival in Sierra Madre, California. The Wistaria Vine in 1990 was declared by the Guinness Book of World Records to be the largest blossoming plant in the world. The Wistaria vine is named after physician Caspar Wistar (1761–1818) by botanist Thomas Nuttall (1786–1859). The general name for the plant is spelled Wisteria. This single wisteria vine covers over an acre. The Wistaria Vine has over 1.5 million blossoms and weighs over 250 tons. The plant is on private land and open to the public once a year during the Wistaria Festival.

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