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 most conspicuous, pale brown, with large papery pieces
peeling off and at times hanging in shreds from the stem. The slash
is reddish-brown and a scented gum-resin exudes, partly drying into
nodules, almost white in colour, readily crumbled.
=The Leaves= are 12-18 inches long, pinnate, with some 7-9 pairs of
long, slender, pointed, deeply-toothed leaflets. These increase in size
towards the top end of the leaf, the basal pair often being very small
and distinct in shape. The terminal pair are frequently partly united
into one for half or more of their length. The leaflets are sessile,
in colour light green and shining, with the venation raised on both
surfaces.
=The Flowers= appear from January to April, and are in large bunches
of racemes at the tips of the large, blunt twigs. The racemes are
from 6-8 inches long and bear numerous white flowers on ½-¾ inch long
stalks. Each flower is ⅝ inch in diameter with 5 white, pointed petals,
10 stamens whose anthers are bent away from the filament at a side
angle, and a small, blunt pistil. The flower disc is red and the flower
scented.
=The Fruits= are 3-angled capsules, elongated pear-shaped, with
prominent bulges opposite the seeds. They are ¾ inch long and the
stigma remains are present. The capsule splits into three and the small
seeds are released, each with a sharp spike at the top end.
=Uses.=—The gum-resin, being scented, is used for burning in houses, or
fumigating clothes, and as an ingredient in medicine.
[Illustration]
=BRIDELIA FERRUGINEA= Benth.—_Kisni, Kirni_. EUPHORBIACEAE.
A small tree of the Tree and Bush savannahs which does not extend
very far north and will not grow away from fairly good soils. It is
rather shapeless, except occasionally in closer forest, where it may
reach a height of 30 feet with a girth of 3-4 feet. This species and
_B. scleroneura_ are similar in habit, with open, formless crowns,
straggling, drooping limbs covered with numerous, slender, erect
twigs which are apt to be burnt back repeatedly by fires and show
the position of leaves and flowers as prominent clusters at frequent
intervals. The distinguishing features are larger leaves of this
species and the absence of the marked crenate edges.
=The Bark= is dark grey, covered with small, close-fitting, prominent
scales. That of the branches is lighter and covered with rectangular
scales, clearly cut in rows. That of the smaller branches is almost
white with vertical, wavy ridges of cork. The slash is crimson.
=The Wood= is brown and the sapwood is dull white. In transverse
section the rings are clear, fine light lines, the pores are very
small, single, double, or in small festoons, the soft tissue not well
developed. The rays are fine, close, fairly straight and evenly spaced.
In vertical section the grain is coarse, and not very straight and
the wood is easily sawn but hard to plane, picking up in patches. The
weight is 60 lbs. a cubic foot.
Public-domain text, read in full here on John Shaqi.
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