Khaya senegalensis which is also known as African mahogany is native to Tropical West Africa and from the family Meliaceae.
This large and tall tree is semi-deciduous. With a large
rounded bushy dark green crown, it reaches a height of 30m.
The compound leaves
are alternate and are about 50-70cm long. Each compound leaf consists of 3-7 leaflets.
The leaflets are usually in opposite pairs, oblong in shape, at about 4-12cm in
length and 2-5 cm in width. They are dark green and glossy on the upper side
and light green on the underside.
The flowers are very small they measure up to
less than 1cm in width and are pollinated by insects. Born in clusters known as
lax (loosely arranged parts), they are pale white or cream in colour. Each
flower has 5 small petals and measure about 4mm in length and 2.5mm in width. This
tree flowers irregularly in Singapore, possibly because flowering is triggered
by the onset of the rainy season in its native habitat, but there is no
distinct rainy season in Singapore.
The fruit is an upright, almost spherical,
woody capsule. It measures from 4-6 cm in diameter, opening by 4 valves from
the apex (pointed end of an object). The fruit colour changes from grey to
black as it ripens and begins to bear seeds once the tree reaches 20 to 25
years old.
The seeds have brown
wings at two ends that are arranged horizontally. Each fruit contains numerous
seeds from 6 or more per cell. They are flat and oval, about 25mm in length and
18mm in width.
The Khaya is one of the hardest African mahoganies and the hardest of the Khaya species. Because of its decorative appearance, the wood is a very popular timber, sapwood is pinkish-tan in colour while the heartwood an attractive dark red-brown. The seeds and leaves are used for treating fever and headache.
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