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 strap-shaped, some 12 inches long, 3-4 inches broad,
with an inch stalk. The margin is waved, the mid-rib alone prominent on
both surfaces. The venation is extremely delicate, visible when held to
the light. The new leaves are bright red, the red colour fading from
the base upwards. The surface is shining, the texture soft. Clustered
round the end 3-4 inches of the twigs, they appear like rosettes. The
delicate venation, short stalk and red tips distinguish it from the
Shea.
=The Flowers= are in clusters on long stalks amongst the leaves and
resemble Apple blossom. They are white, cup-shaped, 1½ inches across,
with 5 notched white petals and a ring of numerous yellow stamens round
a stout bifid pistil. The calyx consists of 5 sepals, 3 small and
round, 2 larger and red tipped, the latter enlarging to form the wings
of the seed. They are scented, visited by bees and appear from November
to February.
=The Fruits= are winged seeds, the wings formed by the enlargement of
the 2 sepals. At first red, they become light green and leathery, the
larger 4 inches, the smaller 2 inches long. The fibrous-coated seed
elongates till it is a pointed cone an inch long, light brown as are
the now dry wings. The seed contains a single kernel, loose when ripe,
about March. Few natives will allow that this tree has any seeds, even
when shown them, a popular obstinacy.
=Uses.=—The wood is too tough to carpenter satisfactorily, but is
suitable for building posts. The seed contains some 45 per cent. of
oil, said to be suitable for soap after testing, but this is not
extracted locally.
[Illustration]
=MAERUA ANGOLENSIS= DC.—_Chichiwa_. CAPPARIDACEAE.
A small tree, widely distributed throughout savannahs of both types,
flourishing equally well in dry sandy soils and richer loamy soils. It
is straggling, often growing in the shade of other trees and partly
supporting itself by them. In the open it is a slender tree about 15
feet in height, the stem dividing and the open low crown with drooping
branches. Occasional examples will reach 25 feet with a 2 feet girth.
It extends up to 13° N.
=The Bark= is dark grey to almost black. That of the smaller branches
is dark brown, profusely spotted with small white lenticels which give
it a mottled appearance, a most distinctive character. Galls on the new
twigs and on the stem are very common.
=The Leaves= are simple, ovate, but variable in length to breadth,
averaging 2 inches long and 1 inch broad. The tip is rounded or
slightly cleft with a small projection of the mid-rib. The colour
is pale and the surface smooth. The mid-rib is prominent beneath,
otherwise the venation is practically unnoticeable. The stalks are ½-1
inch long and the last ¼ inch is thickened and bent at an angle and
when the leaf is plucked the stalk nearly always parts at this bend.
Public-domain text, read in full here on John Shaqi.
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