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 Flowers=, from December to February, are in small cymes in the
axils of the leaves, on the old wood or new shoots. On the new shoots
there is generally one cyme in each axil, on the older twigs there may
be four separate cymes. Each flower is ⅙ inch in diameter, with a very
small 5-pointed calyx, 5 white, oval petals, 5 minute stamens and an
ovary with a bifid, branched style. There are male and female flowers
on the same tree, the female having no stamens.
=The Fruit= is a capsule, ½ inch in diameter, with 3 cells each
containing 2 seeds. They are conspicuous in clusters, turning from pale
green to red.
[Illustration]
=HANNOA UNDULATA= Planch.—_Takandar giwa_. SIMARUBACEAE.
A medium-sized tree which abounds, though not further north than
12° and very local, in Tree savannah and the better type of Bush
savannah. Its bark and leaves, once recognised are a ready means of
identification. It attains a height of 35 feet with girths of 3-5
feet. It grows erect, with vertically ascending branches which form
a high, narrow crown. A bole-length up to 10 feet, but not often
more, is common. It is very subject to attacks by a caterpillar which
skeletonises the leaves and covers the twigs with a lot of silk.
=The Bark= is dull, grey with long vertical ridges and fissures of
very soft, thick cork. A curious effect, due to the absence of marked
scales, is that the bole appears to have no bark at all, but resembles
a dead tree whose trunk has turned grey with exposure. The slash is
reddish.
=The Wood= is pale yellow. In transverse section the rings are faintly
visible, the pores are mostly in little chains of 2-6 or so, having the
appearance of being one long pore divided by partitions, the groups
running in radial direction between the rays. Thin lines of soft tissue
connect the groups. The wood is soft, saws and planes very easily, with
little picking up. The wood requires well seasoning as it is liable to
mould and rot. The weight is 35 lbs. a cubic foot.
=The Leaves= are pinnate, up to 12 inches long with 3 or 4 opposite
pairs and a terminal leaflet. The leaflets are far apart and on slender
stalks an inch or more in length. They vary in size on the one leaf,
up to 2 inches long, excluding the stalk, and almost as broad as long
in the case of the lowest pair and the terminal leaflet, with broadly
cleft tips and abruptly tapering bases. The margins are sinuous, the
mid-rib prominent on both surfaces and the lateral grooved on both
surfaces. They are a dull, dark green above and a yellowish green
beneath. The leaflets are almost at right angles to the main stalk.
=The Flowers= appear from October to November and are in large, loose
panicles, some 12 inches long. Each is about ⅜ inch in diameter with a
small cup-shaped calyx, 6 yellowish petals, 12 stamens, the lower half
of the filaments being covered with hairs, and a short blunt pistil on
a 6-part ovary. The flowers are scented.
Public-domain text, read in full here on John Shaqi.
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