The useful trees of northern NigeriaLely, Hugh Vandervaes
Science
The useful trees of northern Nigeria
Lely, Hugh Vandervaes
Plants, Useful -- Nigeria, Northern; Trees -- Nigeria, Northern
=The Bark= is grey or brown, smooth in young stems and later showing
long, vertical, narrow ridges and stringy fissures. The slash is
red-brown.
=The Leaves= are variable in size, up to 5 inches long and 2½ inches
broad, oval with a pointed tip and a stout ¾ inch long stalk. The
venation is prominent beneath and flush on the upper surface, the
mid-rib very prominent and light coloured. The upper surface is dark
green and smooth, the underneath grey-green. They are tough in texture.
=The Flowers= which appear from December to February are in axillary
spikes up to 3 inches in length crowded with cream-coloured, slightly
scented flowers, each of which has a 4-pointed calyx, 4 minute petals,
8 stamens and a short pistil rising from a calyx full of white hairs.
=The Fruits= are 4-winged, 1-1¼ inches in diameter and length,
conspicuous by their size, tough texture, and the rich, reddish-purple
colour softened by a grey bloom. They are very numerous, crowded, heavy
and hard.
[Illustration]
=COMBRETUM LECANANTHUM= Engl. & Diels.—_Chiriri, Dagera_. COMBRETACEAE.
A very common tree of the more open, dry savannahs and occurring on
hard and barren or dry and sandy soils, often in such quantities as to
form almost pure forests. It occurs mixed with the shrubby _Combretum_
species or by itself in belts and patches on slightly better soil than
is required to support the latter. It is about 20-25 feet high but a
full-grown example will reach 40 feet with a 5 feet bole girth. The
stem is rarely straight, often leaning or twisted and branching low
down. The crown is either of erect branches and twigs, or the latter
may as often as not droop and hang vertically downwards.
=The Bark= is smooth, grey-brown or rust-red in colour, with hardly any
scales, but of a rather fibrous appearance. From it, in the hot season,
large quantities of gum exude, white, yellow or red-brown, poor in
quality, not brittle, but rubber-like, melting in moist heat and drying
only in the dry season. The gum forms strange shapes, from nodules to
long slender spirals. The bark is very thin. The slash is crimson, with
yellow centre.
=The Wood= is a dirty white or cream colour. In transverse section it
is much darker and the pores are very small and in little wavy lines
and festoons, the rays exceedingly fine and close light lines. In the
plank the pores are fine dark lines. In the green state the wood is so
tough as to blunt axes but when it dries it loses its strength and is
often completely destroyed by borer beetle. An unsatisfactory wood of
no value. Weight 56 lbs. a cubic foot. The name “kariye gatari,” or
“break axe” is given to it.
=The Leaves= vary largely in shape and in proportion of length to
width. They average 4-5 inches long and 2-2½ inches wide, tapering both
ends, pointed, shining above, paler beneath, the venation simple and
the lateral nerves inclined far forward. They are in pairs and tend to
lie in the same plane.
Public-domain text, read in full here on John Shaqi.
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