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
A small, erect tree from 10-25 feet high which will grow in the extreme
north in the driest and most barren of soils. It flourishes round the
parallel 14° north and extends right down to the extreme south also.
It is often a stunted, shrub-like tree growing in quantities on bare,
hard, stony soils, but in more open sandy localities will grow a 15
feet bole with an open light crown composed of erect, slender branches.
Old trees spread wide and give a little shade. It can be at once
distinguished by the silvery glister of its leaf on the under side and
by the spikes of closed flowers.
=The Bark= is grey or light brown with small, close-fitting, even-sized
polygonal or rectangular scales.
=The Wood= is pale yellow, discoloured grey in patches. The rings are
fine, close, light lines, the pores are very fine, numerous and evenly
distributed, connected by very fine lines of soft tissue, narrower than
the pores. The grain is fine and the wood is hard, difficult to saw,
not hard to plane and finishes with a hard, smooth surface which will
polish. The weight is 64 lbs. a cubic foot.
=The Leaves= are long, narrow and pointed, 4 inches long and 1½ inches
broad with a 1½ inch stalk. The upper surface is a dark shining green,
the lower glistening silver with minute rust spots all over the
surface. The mid-rib is sunk on the upper and very prominent on the
under surface. The lateral nerves are numerous and parallel. The stalk
and mid-rib are covered with soft brown hairs. The young leaf is bronze
or red-coloured. The leaves droop and tend to fold up along the mid-rib.
=The Flowers= are of two sexes, each on a different tree (dioecious).
They are in racemes, resembling long spikes. The male are the longer,
up to 4 inches, the female up to 2 inches. The male flower has 5
sepals, 5 petals and some 15 stamens all packed up in the bracts, on
short stalks. The females have similar flowers with 3-part styles each
with a bifid stigma. The flower parts are hardly visible to the naked
eye so closely folded are the bracts.
=The Fruit= is a capsule, 3-lobed, one seed in each lobe. They ripen
about November onwards, but may be found for many months in the year.
[Illustration]
=CUSSONIA NIGERICA= Hutch.—_Gwabsa, Takandar giwa_. ARALIACEAE.
This quaint looking species is locally very common, more especially on
rocky hills where, in its leafless condition, it resembles some cactus
growth. It is not, as a rule, above 20 feet in height, but may reach
over 30 feet with a girth of 4-5 feet. The girth is large in proportion
to the height and there is practically always a clean bole, sometimes
divided at the base into two stems, with an umbrella-like crown,
flat-topped. The form of the tree is best seen in its leafless state,
when it has the appearance of innumerable stags’ horns, the branches
being very thick and blunted at the ends. In leaf, its more or less
grotesque appearance is disguised by the large and handsome foliage.
Public-domain text, read in full here on John Shaqi.
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