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 Wood= is pale red. In transverse section the rings show as fine
white lines between broader, darker bands. The pores are small,
numerous and in rows between the long fine rays which are visible as
small bands in radial section. In the plank the pores appear numerous
and short and the grain is marked faintly in dark and light lines. The
pores glisten with resin. The wood is not hard, easy to work and planes
to a soft finish with no polish. It is liable to radial cracks but is
otherwise a sound, clean timber.
=The Leaves= are up to a foot long and 6 inches wide, oval, rounded at
the tip and gradually tapering to the short, broad stalk. They are a
dark, brightly shining green, much paler beneath, covered with short,
erect, stiff hairs, feeling slightly rough to the touch. The mid-rib is
raised a little on the upper surface and is very prominent beneath. The
nerves are light in colour.
=The Flowers= are monoecious, male and female on the same tree, the
female situated below the male. Both are similar in appearance, grouped
in clusters round the thick shoots at the base of the leaves, and their
parts are surrounded by thick yellow bracts in place of petals. The
male has dense clusters of separate flowers, compressed into a ball,
each minute flower having 5 2-anthered stamens and a rudimentary ovary
amongst minute bracts. The female has 3 triple stigmas. The flowers
appear during the rains.
=The Fruits= are like figs at first sight, but very different in
structure. Borne in long clusters on the leafless twigs, or amongst the
leaves, they ripen in March or April and may persist till July. They
are ¾ inch in diameter, round or slightly pear-shaped, yellow and juicy
ripening to dry and red-brown. The remains of the stigma show at the
tip as three small black, shredded tufts radiating from the centre, and
the division of the fruit shows itself on the outside by three slight
ridges. A cross section through the fleshy fruit shows the design of
the curiously folded green cotyledons lying in the kernels. The fruit
coat is covered with short stiff hairs. The seeds are hard, ½ inch
long, oval and grooved.
[Illustration]
=VERNONIA AMYGDALINA= Del.—_Shiwaka_. COMPOSITAE.
A very common shrub or small tree, abundant on the banks of streams and
large rivers where it forms an impenetrable thicket. It has either a
number of stems from ground level or a single low-branched stem forming
a rounded crown up to 12 or 15 feet high.
=The Bark= is light grey and smooth with no distinctive character.
=The Leaves= are some 6 inches long and 1¾ inches wide, this being an
average, the largest reaching 8 inches in length and 3 inches in width.
They are alternate on the shoots, long and tapering at both ends with
an acute point and stalks about ½ inch long. The margins are waved. The
upper surface is a dull dark green, paler beneath with the venation
prominent. There are often hairs on the surface.
Public-domain text, read in full here on John Shaqi.
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