Entandrophragma angolense

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Entandrophragma angolense
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Meliaceae
Genus: Entandrophragma
Species:
E. angolense
Binomial name
Entandrophragma angolense
(Welw.) Panshin

Entandrophragma angolense, called the tiama, is a tree species with alternate, pinnately compound leaves that are clustered at the ends of branches. It is within the family Meliaceae and has a wide distribution area, occurring in moist semi-deciduous and evergreen forest regions of Tropical Africa from Sierra Leone to Uganda. [2]

Contents

Harvesting for timber has caused the species to become vulnerable in certain countries. [2]

Taxonomy

Entandrophragma angolense was first indicated as belonging to the Swietenia family but upon a revision in 1894 by de Candolle, the species was transferred to a new genus Entandrophragma. [3] In 2021, up to 10 taxa are placed as synonyms of the species in two database. [4] [5]

Description

The tree can grow to a height of 60 meters and reach a diameter of 200 cm, its base often has developed buttresses that can reach a height of 6 meters, and extending as surface roots, the trunk is branchless for up to 30 meters. [6] The grey-brown bark tends to be thin and smooth with irregular flaking in small and large pieces leaving concave or mussel-shell shaped scars, slash is pink to reddish. [2] Leaves are paripinnately compound, up to 50 cm long and tufted at the ends of branches, 4-11 pairs of opposite leaflets per pinnae, petiole is up to 18 cm long. [7] [2] Leaf-blade outline is commonly oblong to obovate, 3.5–12 cm long and 2–4 cm wide, upper surface is dark green and coriaceous. Flowers are in dense panicles, clustered at the end of branches, petal is greenish white in color, flowering period is between November and February. [2] Fruits is a large pendulous capsule, up to 22 cm long. [6] [7]

Distribution

The species distribution is wide spread in tropical Africa, its native range is within the evergreen and semi-deciduous forest zones of West, Central and East Africa. [7] In Eastern Africa, majorly Kenya and Uganda, occurrence is of a lower density than in Central and West Africa. [8]

Chemistry

Chemical compounds including the limonoids: 7α- acetoxydihydronomilin, 7α- obacunylacetate and Methyl angolensate have been isolated from methanol extracts of the stem bark of the species. [9] [10]

Uses

Timber traded as Tiama mahogany, White tiama or Genu Nohur is used for cabinet making, furniture and interior and exterior joinery. [2] In traditional medicine, extracts of the stem bark is used to treat various gastrointestinal afflictions and a decoction is consumed to treat fever. [11]

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<i>Sacoglottis gabonensis</i> Species of tree

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<i>Daniellia ogea</i> Species of tree

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References

  1. ↑ Hills, R. (2021). "Entandrophragma angolense". IUCN Red List of Threatened Species . 2021: e.T33049A68080926. Retrieved 12 November 2023.
  2. 1 2 3 4 5 6 Timbers. D. Louppe, A. A. Oteng-Amoako, M. Brink, Plant Resources of Tropical Africa. Wageningen: PROTA Foundation. 2008. p. 235. ISBN   978-90-5782-209-4. OCLC   299747129.{{cite book}}: CS1 maint: others (link)
  3. ↑ Monthe, Franck K.; Duminil, Jérôme; Kasongo Yakusu, Emmanuel; Beeckman, Hans; Bourland, Nils; Doucet, Jean-Louis; Sosef, Marc S. M.; Hardy, Olivier J. (2018). "The African timber tree Entandrophragma congoense (Pierre ex De Wild.) A.Chev. is morphologically and genetically distinct from Entandrophragma angolense (Welw.) C.DC". Tree Genetics & Genomes. 14 (5): 66. doi:10.1007/s11295-018-1277-6. hdl: 2268/227250 . ISSN   1614-2942. S2CID   52046034.
  4. ↑ "Entandrophragma angolense (Welw.) Panshin | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2021-10-18.
  5. ↑ "Entandrophragma angolense (Welw.) C.DC". www.gbif.org. Retrieved 2021-10-18.
  6. 1 2 Voorhoeve, A. G. (1979). Liberian high forest trees : a systematic botanical study of the 75 most important or frequent high forest trees, with reference to numerous related species (2nd impr ed.). Wageningen: Pudoc. ISBN   90-220-0701-4. OCLC   63303450.
  7. 1 2 3 Kasongo Yakusu, Emmanuel; Monthe, Franck; Bourland, Nils; Hardy, Olivier J.; Loupe, Dominique; Bola Mbele Lokanda, Félicien; Hubau, Wannes; Kahindo Muhongya, Jean-Marie; Van den Bulcke, Jan; Van Acker, Joris; Beeckman, Hans (2021). "Entandrophragma : taxonomy and ecology of a genus of African tree species with economic importance : a review". Biotechnologie Agronomie Société et Environnement. 5 (3): 140–153. hdl:1854/LU-8710779. ISSN   1370-6233.
  8. ↑ Mbatudde, M.; Majaliwa, G.; Eilu, G.; Kakudidi, E.; Dalitz, H. (2013). "Potential distribution of vulnerable Entandrophragma angolense (Welw.) C. DC. (Meliaceae) in East Africa". African Journal of Ecology. 51 (3): 471–481. doi:10.1111/aje.12058.
  9. ↑ Njar, V. C.; Adesanwo, J. K.; Raji, Y. (1995). "Methyl angolensate: the antiulcer agent of the stem bark of Entandrophragma angolense". Planta Medica. 61 (1): 91–92. doi:10.1055/s-2006-958015. ISSN   0032-0943. PMID   7701005. S2CID   260278970.
  10. ↑ Bickiia, J; Tchouyab, Grf; Tchouankeub, Jc; Tsamo, E (2008-09-22). "The antiplasmodial agents of the stem bark of Entandrophragma angolense (Meliaceae)". African Journal of Traditional, Complementary and Alternative Medicines. 4 (2): 135–139. doi: 10.4314/ajtcam.v4i2.31188 . ISSN   0189-6016.
  11. ↑ Orisadipe, Abayomi; Amos, Samson; Adesomoju, Akinbobola; Binda, Lucy; Emeje, Martins; Okogun, Joseph; Wambebe, Charles; Gamaniel, Karniyus (2001). "Spasmolytic Activity of Methyl Angolensate. A Triterpenoid Isolated from Entandrophragma angolense". Biological and Pharmaceutical Bulletin. 24 (4): 364–367. doi: 10.1248/bpb.24.364 . ISSN   0918-6158. PMID   11305596.
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