Clausena

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Clausena is a genus of flowering plants in the citrus family, Rutaceae. It was first defined by the Dutch botanist Nicolaas Laurens Burman in 1768. It is distributed in Africa, southern Asia, Australia, and the Pacific Islands.[3]

This genus is in the subfamily Aurantioideae, which also includes genus Citrus. It is in the subtribe Clauseninae, which are known technically as the remote citroid fruit trees.[4][5]

Clausena was named for the Norwegian clergyman, Peder Claussøn Friis (1545-1614), the translator of the Icelandic historian and poet, Snorri Sturluson.[6]

Description

The genus includes shrubs and trees. Some species are variable, with many forms. C. anisata, for example has been described as a shrub under a meter tall and as a tree of 20 metres (66 ft).[4] The leaves of these plants are pinnate, divided into leaflets. The inflorescence varies in form, but is generally a cluster of several flowers with 4 or 5 petals and sepals. The fruit is a berry which lacks the pulp of many other fruits in the citrus family.[3] The genus can be distinguished from related plants by the presence of a gynophore, a structure supporting the ovary in the flower. It looks very different in the various species, however, and can be hard to recognize.[4]

Uses

C. anisata is a tree used for its wood,[7] and in traditional medicine.[8] C. excavata is used medicinally in Asia for a variety of conditions, including snakebite, malaria, dysentery, and HIV infection.[9] Some species, such as C. indica and C. lansium (wampi), produce edible fruit. Wampi is cultivated as a fruit tree, and though it is only a remote relative of citrus, it can be grafted to various citrus trees. There are sour, sweet, and intermediate varieties of C. lansium.[4]

Fossil record

A Clausena leaf fossil from the Oligocene of Ethiopia, represents so far the oldest record of the genus.[10]

Diversity

The taxonomy of the genus is unclear.[4] There are between about 15 and 30 species.[3] Many formerly used names were made synonyms in a 1994 revision.[11]

Plants of the World Online includes:[12][13]

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  1. Clausena agasthyamalayana Template:Au
  2. Clausena anisata Template:Au - horsewood
  3. Clausena anisum-olens Template:Au (syn. C. sanki, nom. rejic.)
  4. Clausena austroindica Template:Au
  5. Clausena brevistyla Template:Au
  6. Clausena emarginata Template:Au
  7. Clausena engleri Template:Au
  8. Clausena excavata Template:Au
  9. Clausena hainanensis Template:Au
  10. Clausena harmandiana Template:Au
  11. Clausena henryi Template:Au
  12. Clausena heptaphylla Template:Au
  13. Clausena indica Template:Au
  14. Clausena lansium Template:Au– wampi, wampee, Chinese clausena
  15. Clausena lenis Template:Au
  16. Clausena luxurians Template:Au
  17. Clausena pentaphylla Template:Au
  18. Clausena poilanei Template:Au[11]
  19. Clausena wallichii Template:Au
  20. Clausena yunnanensis Template:Au

Note: Clausena smyrelliana[8] is a may be a synonym of Bergera crenulata[12]

References

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  1. ^ Script error: No such module "Template wrapper".
  2. ^ Page Module:Citation/CS1/styles.css has no content."Clausena Burm.f."
  3. ^ a b c Clausena. Flora of China.
  4. ^ a b c d e Swingle, W. T., rev. P. C. Reece. Chapter 3: The Botany of Citrus and its Wild Relatives. Script error: No such module "webarchive". In: The Citrus Industry vol. 1. Webber, H. J. (ed.). Berkeley: University of California Press. 1967.
  5. ^ Citrus Variety Collection. College of Natural and Agricultural Sciences. University of California, Riverside.
  6. ^ "CRC World Dictionary of Medicinal and Poisonous Plants" - Umberto Quattrocchi (2012)
  7. ^ Script error: No such module "template wrapper".
  8. ^ a b Page Module:Citation/CS1/styles.css has no content.Forster, Paul I. (2000). "Clausena smyrelliana (Rutaceae: Aurantioideae), a new and critically endangered species from south-east Queensland". Austrobaileya. 5 (4): 715–720. JSTOR 41738949.
  9. ^ Thongthoom, T., et al. (2010). Biological activity of chemical constituents from Clausena harmandiana. Archives of Pharmacal Research 33(5), 675-80.
  10. ^ Citrus linczangensis sp. n., a Leaf Fossil of Rutaceae from the Late Miocene of Yunnan, China by Sanping Xie, Steven R Manchester, Kenan Liu and Bainian Sun - International Journal of Plant Sciences 174(8):1201-1207 October 2013.
  11. ^ a b Molino, J. F. (1994). Révision du genre Clausena Burm. f.(Rutaceae). Adansonia 1, 105-53.
  12. ^ a b Plants of the World Online: Clausena Burm.f. (retrieved 18 March 2026)
  13. ^ GRIN Species Records of Clausena. Germplasm Resources Information Network (GRIN).

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