Leplaea thompsonii
| Leplaea thompsonii | ||||||||||||
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| Leplaea thompsonii | ||||||||||||
| ( Sprague & Hutch. ) EJMKoenen & JJde Wilde |
Leplaea thompsonii (Syn .: Guarea thompsonii ) is a species of the mahogany family(Meliaceae). In the home areas the common names "Black Guarea" or "Dark Bossé" are used.
description
Appearance and leaf
Leplaea thompsonii grows as an evergreen tree up to 35–45 meters high. It grows slowly and reaches a trunk diameter ( chest height diameter = DBH) of about 2.7 meters in 200 years. There are buttress roots formed. The tree has a milky sap .
The alternate and spirally arranged leaves on the branches are divided into a petiole and a leaf blade. The 6 to 14 cm long petiole is weakly winged and flattened in the lower part. The bald sheet rhachis is 8 to 30 cm long. The leaf blade is pinnate unpaired with rarely three, mostly four to eight pairs of more or less opposite pinnate leaves. The stalks of the lateral leaflets are 5 to 15 mm long and those of the terminal leaflet are about 2-3 cm long. With a length of 13 to 28 cm and a width of 4 to 10 cm, the leaflets are oblong-elliptical to obovate with a pointed and slightly asymmetrical base and rounded and pointed to pointed upper end. Stipules are missing.
Inflorescence and flower
Leplaea thompsonii is dioeciously segregated ( dioecious ). The lateral, racemose or panicle inflorescence is up to 30 cm long. The fragrant, functionally unisexual, very similar, yellowish and short-stalked flowers are radial symmetry and four or five-fold with a double flower envelope. The flower stalks sit on a "joint". The four or five, small sepals are fused cup-shaped with minimal lobes. The four or five petals are free. The 7 to 9 stamens are fused into a slightly urn-shaped tube with a slightly lobed top. The upper, multi-chambered ovary is 6 to 7 mm long. The male flowers have a pistillode and the female have staminodes with antherodes.
Fruit and seeds
With a diameter of 3 to 4 cm, the almost spherical, bald and reddish, somewhat rough capsule fruit opens with three to four valves and usually contains one to two, rarely up to four or six seeds. With a length of about 2.8 cm; with one seed per compartment or 1.4 cm with two, and a width of about 1.5-1.8 cm, slightly kidney-shaped to round-edged, triangular or then, with two per compartment conical, seeds have a fleshy reddish-orange seed coat ( Sarcotesta ), except on the great hilum .
Spread and endangerment
Leplaea thompsonii is common in tropical Africa. They can be found (from west to east) in Liberia , Ivory Coast , Ghana , Nigeria , Cameroon , Gabon , the Republic of the Congo, and the Democratic Republic of the Congo .
The population of Leplaea thompsonii is endangered by the logging in its homeland. The degree of danger is classified in the IUCN Red List as vulnerable = endangered (in 2006).
use
Guarea thompsonii is used as wood for the manufacture of furniture.
literature
- Timbers 1 , Volume 7 by D. Louppe, AA Oteng-Amoako & M. Brink (editors): Plant resources of tropical Africa . Prota Verlag, 2008. ISBN 978-90-5782-209-4 , limited preview in the Google book search RHMJ Lemmens: Guarea thompsonii from page 304.
- Erik JM Koenen, Jan JFE de Wilde: A taxonomic revision of the reinstated genus Leplaea and the newly recognized genus Neoguarea (Meliaceae, Sapindales): The exclusion of Guarea from Africa. In: Plant Ecology and Evolution. 145 (2), 2012, pp. 209–241, online (PDF; 2.9 MB).
Individual evidence
- ↑ a b c Leplaea thompsonii in the endangered Red List species the IUCN 2011. Posted by: World Conservation Monitoring Center, 1998. Accessed on 23/08/2011.