Khaya
| Khaya | ||||||||||||
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Khaya senegalensis |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Khaya | ||||||||||||
| A.Juss. |
Khaya ("African Mahogany", English: "African Mahogany", French: "Acajou") is a genus of plants in the mahogany family(Meliaceae). The approximately six species occur in tropical Africa south of the Sahara from Senegal to Uganda , in the south to Tanzania and Angola , as well as in Madagascar and the Comoros .
description
Appearance and leaves
Khaya species grow as trees . The alternate and spiral leaves on the branches are petiolate. The leaf blades are pinnate unpaired. The leafless leaflets have a smooth edge.
Inflorescences and flowers
Many flowers stand together in lateral or almost terminal, thyrsian inflorescences . Khaya species are single sexed ( monoecious ). The flowers look like hermaphroditic but are functionally unisex.
The flowers are radial symmetry and four or five-fold with a double flower envelope . The four or five sepals are only fused at their base. The four or five petals are free and twisted. The eight or ten stamens are fused together in a jug, kettle or cup shape. The disc is cushion-shaped. Four or five carpels are fused into an upper, four- or five- chamber ovary. Each ovary chamber usually contains 12 to 16 (rarely up to 18) amphitropic ovules . The scar is disc-shaped with four or five furrows at the top.
Fruits and seeds
The more or less spherical capsule fruits are woody when ripe and open with four or five flaps. The seeds, which are winged all around, contain a sparse endosperm and an embryo with two flat cotyledons ( cotyledons ) and lateral radicles.
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use
The wood (other trade names Khaya Mahogany, Grand Bassam, N'Dola, N'Gollon, Undianunu, Zaminguila) has a density of 720 to 750 kg / m 3 . It is used for countertops, veneers, parquet, musical instruments and boat fittings, among other things.
Systematics
The genus Khaya was established by Adrien Henri Laurent de Jussieu in 1830 in Mémoires du Muséum d'Histoire Naturelle , 19, p. 249, plate 10. Type species is Khaya senegalensis (Desr.) A.Juss. . A synonym for Khaya A.Juss. is Garretia Welw. .
The genus Khaya contains about six species (here with their distribution):
- Khaya anthotheca (Welw.) C.DC. (Syn .: Garretia anthotheca Welw. , Khaya nyasica Stapf ex Baker f. ): The distribution area is in southern Africa .
- Khaya grandifoliola C.DC. : It is most widespread, as far as Cameroon , Congo , Angola and Uganda.
- Khaya ivorensis A. Chev. : It occurs in Ghana and the Ivory Coast .
- Khaya madagascariensis Jum. & H.Perrier : It occurs in Madagascar and the Comoros . It is classified in the IUCN's Red List of Endangered Speciesas "endangered".
- Khaya senegalensis (Desr.) A.Juss. (Syn .: Swietenia senegalensis Desr. ): The wide distribution area is in tropical Africa.
Khaya belongs to the family of the Meliaceae or meliaceae , which includes the genera Swietenia (species from "American mahogany" are called) and Entandrophragma (species of this genus are named "Security Police", "Sapelli", "Kosipo" and "Tiama") belong.
swell
- Hua Peng & David J. Mabberley: Khaya in the Flora of China. Volume 11, 2008, p. 116, online. (Section description).
Individual evidence
- ↑ Robert Zander : Zander hand dictionary of plant names. Edited by Fritz Encke , Günther Buchheim, Siegmund Seybold . 15th edition, corrected reprint of the 14th edition. Eugen Ulmer, Stuttgart 1994, ISBN 3-8001-5072-7 .
- ↑ Khaya-Mahagoni on schreiner-seiten.de, accessed on November 15, 2016.
- ↑ HBW Holzhandel GmbH .
- ^ A b Khaya in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland.
- ↑ Khaya at Tropicos.org. Missouri Botanical Garden, St. Louis.
- ↑ Khaya madagascariensis in the Red List of Threatened Species of the IUCN 2011. Posted by: World Conservation Monitoring Center, 1998. Retrieved on September 22, 2011 ..
