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 Leaves= are a very dark and rather dull green, the under surface
with a slight sheen. The venation is very delicate and not raised on
either surface, though the mid-rib is most prominent underneath. They
are some 6 inches long and 2½ inches wide, with a short stalk. The
young foliage is bright red, which turns brownish before the final
green. The shade is dense and nothing grows under it.
=The Flowers= are borne in small clusters in the axils of the leaves
in February. They are green and not conspicuous. Each consists of a
5-lobed calyx on a longish stalk, 5 petals set in spiral formation, one
over the other and inside the closed corolla are 10 stamens attached to
the petals.
=The Fruit= is about an inch in diameter, green at first, with the
crinkly calyx much enlarged and toughened, ripening to yellow with a
crisp rind, a soft, sweet, edible flesh and from 4-6 seeds. The seeds
are very hard with shiny, rich red-brown coat and grey interior into
which the red colour of the coat runs in streaks as seen in section.
The seeds are grouped radially round the centre with thin, jelly-like
partitions between each. The fruit falls entire from March onwards.
=Uses.=—The tree is cut into planks for various uses and the timber is
very durable though a little too heavy. Canoes have been made of it.
The fruits are eaten fresh by the natives.
[Illustration]
=EKEBERGIA SENEGALENSIS= A. Juss.—_Madachin dutsi_. MELIACEAE.
This not very common species is found in Bauchi, Zaria, S. Katsina,
etc., and has not been observed above 11½° N. It inhabits the outskirts
of “kurmis” or the open forests where the soil is good. Considerable
quantities occur just below the 4,000 feet level on the Bauchi plateau.
The similarity of leaves, flowers and fruits and its rocky habitat are
responsible for its local name. It reaches 30 feet in height with a
girth of 2-3 feet, rarely has any bole length over 10 feet, but as a
rule a number of acutely ascending limbs forming a dense oval crown. It
stands shade well and there its growth is taller and more slender and
open and inclined to spread. The terminal foliage is noticeable.
=The Bark= is smooth and dark grey, often with marked light and dark
patches, and on younger stems or branches is covered with white
lenticels in vertical rows. The slash is crimson with white streaks.
The bark of older trees is roughish, with close-fitting, small scales.
=The Leaves= are about 15 inches long, pinnate, with 6-10 pairs of
opposite, or nearly, pointed, wavy-edged leaflets some 3 inches long,
a dull dark green above, pale beneath, with a prominent mid-rib on the
under side which is reddish, as is the stalk of the leaf. They are
borne on the last foot of the twig in erect, rosette-like bunches.
=The Flowers= are in panicles 5-6 inches long, amongst the leaves in
February and March. Each flower has 5 pale green petals, 10 stamens
with black anthers and a knobbed pistil. The filaments of the stamens
are united up to the anthers.
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