Alangium

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File:Alangium salviifolium Engler.png
Alangium salviifolium

Alangium is a small genus of flowering plants. The genus is included either in a broad view of the dogwood family Cornaceae, or as the sole member of its own family Alangiaceae.[1] Alangium has about 40 species, but some of the species boundaries are not entirely clear.[2] The type species for Alangium is Alangium decapetalum, which is now treated as a subspecies of Alangium salviifolium.[3] All of the species are shrubs or small trees, except the liana Alangium kwangsiense.[2] A. chinense, A. platanifolium, and A. salviifolium are known in cultivation.[4]

File:Fruits of alangium.jpg
Fruits of alangium

Range

The genus consists of small trees, shrubs and lianas, and is native to western Africa, Madagascar, southern and eastern Asia (China, Malaysia, Indonesia, and the Philippines), tropical Australia, the western Pacific Ocean islands, and New Caledonia. Most of the species are native to tropical and subtropical regions of east and southeast Asia.[2] Five of the species extend well outside of this area. Alangium platanifolium extends from east Asia into Russia. Alangium chinense (sensu lato) extends from southeast Asia to Africa. Alangium salviifolium is the most widespread species, ranging from Africa to Australia, Fiji, and New Caledonia. Alangium villosum occurs from southeast Asia to Australia and the western Pacific Islands. Alangium grisolleoides is endemic to Madagascar and gives the genus a disjunct distribution.

Alangium species are used as food plants by the larvae of some Lepidoptera species in the Geometroidea-Drepanoidea assemblage including engrailed (Geometridae) and the subfamily Cyclidiinae (Drepanidae).

Etymology

The name Alangium is a Latinization, derived from the Malayalam name alangi, which, in Kerala, refers to Alangium salviifolium.[5] It was named in 1783 by Jean-Baptiste Lamarck in his Encyclopédie Méthodique.[6][7]

Paleontological record

The wood, fruit, and pollen of Alangium are distinctive. Fossils of Alangium have been recognized from the early Eocene of England and the middle Eocene of western North America. In former times, Alangium was far more widespread than it is today.[2]

Species

since April 2014Template:Dated maintenance category (articles)Script error: No such module "Check for unknown parameters". The Plant List recognises 42 accepted species (including infraspecific names):[8]

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Characteristics

Differences from the other genera in Cornaceae include articulated pedicels, subulate bracts, bitegmic seeds and the single-seeded fruit. The entire or lobed leaves are alternate. The bisexual (rarely unisexual) nectariferous flowers are arranged in axillary cymes. The flowers have 4-10 small sepals and 4-10 linear petals. There are 4–40 stamens distributed in a single cycle. The ovary is inferior and bilocular (sometimes unilocular). The fruit is drupe.

A detailed description of Alangium can be found at Flora of China.[9] Detailed botanical illustrations are available for several species.[10]

Taxonomy

In 2011, a phylogenetic analysis of DNA sequences showed that Alangium is sister to Cornus.[1] Since 1939, Alangium has been divided into four sections: Conostigma, Rhytidandra, Marlea, and Alangium. Some authors have raised Marlea and Rhytidandra to generic rank. The intergeneric classification of Alangium will require a few changes.[2]

Traditional uses

One species, Alangium chinense (Template:Lang-zh), is considered one of the fifty fundamental herbs in traditional Chinese medicine.

References

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  1. ↑ a b Qiu-Yun (Jenny) Xiang, David T. Thomas, and Qiao Ping Xiang. 2011. "Resolving and dating the phylogeny of Cornales - Effects of taxon sampling, data partitions, and fossil calibrations". Molecular Phylogenetics and Evolution 59(1):123-138. Script error: No such module "CS1 identifiers".
  2. ↑ a b c d e Chun-Miao Feng, Steven R. Manchester, and Qiu-Yun (Jenny) Xiang. 2009. "Phylogeny and biogeography of Alangiaceae (Cornales) inferred from DNA sequences, morphology, and fossils". Molecular Phylogenetics and Evolution 51(2):201-214. Script error: No such module "CS1 identifiers".
  3. ↑ Alangium In: Index Nominum Genericorum. In: Regnum Vegetabile (see External links below).
  4. ↑ Anthony Huxley, Mark Griffiths, and Margot Levy (1992). The New Royal Horticultural Society Dictionary of Gardening. The Macmillan Press,Limited: London. The Stockton Press: New York. Template:ISBN (set).
  5. ↑ Umberto Quattrocchi. 2000. CRC World Dictionary of Plant Names volume I. CRC Press: Boca Raton; New York; Washington,DC;, USA. London, UK. Template:ISBN (vol. I).
  6. ↑ Alangium At: International Plant Names Index. (See External links below).
  7. ↑ Jean-Baptiste Lamarck. 1783. Encyclopédie Méthodique: botanique. 1(1):174
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Haining Qin and Chamlong Phengklai. 2007. Alangium pages 304-308. In: Wu Zhengyi, Peter H. Raven, and Hong Deyuan (editors). 1994 onward. Flora of China vol. 13: Clusiaceae - Araliaceae. Science Press: Beijing, China; and Missouri Botanical Garden Press: St. Louis, MO, USA. Template:ISBN(vol. 13) Template:ISBN (set). (See External links below).
  10. ↑ Wu Zhengyi, Peter H. Raven, Hong Deyuan (editors), and Zhang Libing (illustrations editor). 2008. Flora of China Illustrations, vol. 13: Clusiaceae - Araliaceae: 328-333. Science Press: Beijing, China; and Missouri Botanical Garden Press: St. Louis, MO, USA. Template:ISBN.

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External links

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