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Boxthorn
African Boxthorn (Lycium ferocissimum)
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Solanales
Family: Solanaceae
Subfamily: Solanoideae
Tribe: Lycieae[1]
Genus: Lycium
L.
Species

About 90, see text

Boxthorn (Lycium) is a genus of the nightshade family (Solanaceae), containing about 90 species of plants native throughout much of the temperate and subtropical zones of the world. They are mostly found in dry, semi-saline environments.

Other common names include desert-thorn, Christmas berry, wolfberry, Matrimony vine, and Duke of Argyll's tea tree. Goji is a common English name made popular by several American-made juices and dried berries sometimes branded as "Tibetan" or "Himalayan" goji berries, although these terms do not geographically represent where the berries actually originate.

There are ~20 species in North America, ~30 species in South America, ~30 species in Africa, ~10 species in Eurasia, and one species in Australia. Grabowskia and Phrodus join Lycium in the tribe Lycieae, and are the genera most closely related to boxthorn.

Contents

Description

They are long-lived, perennial, thorny shrubs, with deciduous alternate, simple leaves 1–8 centimetres (0.39–3.1 in) long. The flowers are solitary or in small clusters, 6–25 millimetres (0.24–0.98 in) diameter, with a corolla of five purple, white or greenish-white petals joined together at their bases. The fruit is fleshy, multiseeded berry 8–20 millimetres (0.31–0.79 in) diameter that may be red, yellow, orange, purple or black. These fruit resemble nightshade and bittersweet berries. In some species called wolfberries or "longevity fruit" (notably L. barbarum and L. chinense), the fruit is edible.

Most species of Lycium are cosexual (all flowers have both male and female function), however, several species exhibit sexual dimorphism. Evidence suggests that sexual dimorphism has evolved more than once in the genus. There are species that have both monoecious and dioecious populations, most notably L. californicum.

Uses

The plant has been known to European herbalists since ancient times and was traded from the Far East to Europe by the Romans already, for example via Ariaca and the port of Barbarikon near today's Karachi, as mentioned in the Periplus of the Erythraean Sea. In his Naturalis historia, Pliny the Elder describes boxthorn as a medicinal plant recommended as a treatment for sore eyes and inflammation, as does Pedanius Dioscorides in his P. Dioscoridae pharmacorum simplicium reique medicae[2].

Boxthorn is mentioned in the biblical Book of Proverbs as besetting the paths of the wicked (Proverbs 22:5). In his 1753 publication Species Plantarum, Linnaeus describes three Lycium species: L. afrum, L. barbarum, and L. europaeum[2].

L. barbarum wolfberries

The fruit, leaves, and bark of certain species have been used in China throughout more than 2,000 years of recorded history. Wolfberries are known in China as gǒu qǐ zǐ (枸杞子), and are processed into herbal teas, soups, juices, and alcoholic beverages. The bark is also used, it is known in Chinese as dì gǔ pí (地骨皮).

The berries may also be used whole; in traditional Chinese medicine they are always cooked, boiled either by themselves or in combination with other herbs; or as an ingredient in a soup. Whole wolfberries are used in this way for a variety of purposes in traditional Korean medicine and traditional Tibetan medicine, where boxthorn is called dre-tsher-ma ("ghost thorn"). It is a rare ingredient in kampō (traditional Japanese medicine), where the fruit is called kukoshi (クコシ) and the bark jikoppi (ジコッピ); these terms are derived from the Chinese names.

Ecology

Due to its ecologial requirements, boxthorns may be useful as a crop in arid regions. However, at least African Boxthorn (L. ferocissimum) has shown to be able to spread uncontrollably and become an invasive weed in Australia.

Lycium species are used as food plants by the larvae of some Lepidoptera species including Coleophora vigilis (recorded on L. ferocissimum).

Selected species

Flowering Lycium europaeum
ʻŌhelo kai (L. sandwicense) with fruit
  • Lycium ferocissimumAfrican Boxthorn
  • Lycium fremontii
  • Lycium gariepense
  • Lycium grandicalyx
  • Lycium horridum
  • Lycium hirsutum
  • Lycium macrodon
  • Lycium mascarenense A.M. Venter & A.J. Scott (= L. tenue var. sieberi)
  • Lycium nodosum
  • Lycium oxycarpum Dunal
  • Lycium pallidum
  • Lycium pilifolium
  • Lycium pumilum
  • Lycium ruthenicum
  • Lycium sandwicense A.GrayʻŌhelo kai (Hawaiʻi)
  • Lycium schizocalyx
  • Lycium schweinfurthii
  • Lycium shawii Roem. & Schult. – Arabian Boxthorn
  • Lycium sokotranum
  • Lycium strandveldense
  • Lycium tenue L.
  • Lycium tenuispinosum
  • Lycium tetrandrum
  • Lycium villosum

"Lycium eleagnus", "Lycium eleganus" and "Lycium eleganus barbarum" are obsolete or invented names often used to promote "authentic" "Tibetan goji". Lycium foetidum and L. japonicum are junior synonyms of Serissa foetida = S. japonica.

Cultural/Historical References

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Religion

Islam

  • In the Muslim text Sahih Muslim, Book 041, Number 6985[3], the boxthorn, or gharqad, is described as 'the tree of the Jews':

    The last hour would not come unless the Muslims will fight against the Jews and the Muslims would kill them until the Jews would hide themselves behind a stone or a tree and a stone or a tree would say: Muslim, or the servant of Allah, there is a Jew behind me; come and kill him; but the tree Gharqad would not say, for it is the tree of the Jews.

Muslims are not ordered to kill Jews because of their religion, infact throughout history Muslims protected Jews from Medieval Inquisition courts in Spain, but the stated prophetic narration refers to the end of time when the Jews will follow the Antichrist and spread chaos in the world, according to Islamic belief.

See also

Footnotes

References

  • Dharmananda, Subhuti (1997): Lycium Fruit. Retrieved 2007-OCT-17.
  • Hitchcock, Charles Leo (1932): A Monographic Study of the Genus Lycium of the Western Hemisphere. Annals of the Missouri Botanical Garden 19(2/3): 179-348 + 350-366. doi:10.2307/2394155 (First page image)

External links


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