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 alternate, assuming one plane. They are 4-5 inches
long and 2¼-2½ inches broad, with slightly waved edges, the nerves
reaching the edge. They are dark green above, olive green beneath, with
the venation very prominent and covered with brownish hairs, especially
on the short stalk and mid-rib.
=The Flowers=, male and female on the same tree are in small, compact
clusters in the leaf axils from March to June. The male flowers have
a calyx of 5 sepals, 5 minute petals and 5 radiating stamens, joined
at the base into a short column. The female flower has the same calyx,
longer, narrower petals and two styles which are forked. The male
flowers have a shiny yellow disc.
=The Fruits= are small black ovoid drupes, becoming veined and wrinkled
when dry, with a single cell containing two seeds. They are ⅜ inch long
and flattened at the top, and very persistent on the twigs.
[Illustration]
=BRIDELIA SCLERONEURA= Müll. Arg.—_Kisni_. EUPHORBIACEAE.
This is a small tree, without any definite form, which grows up to
15 or 20 feet high, with, occasionally a stem some 6 feet high and a
misshapen crown. It is distinguished by the small clusters of minute
flowers in the leaf axils and the crenate margined leaves which lie in
one plane on long, slender, drooping twigs.
=The Bark=, in old trees, is quite black, with long fissures and
fibrous ridges; in young trees it is white, or black and white in
patches, with soft, corky scales which fall in large pieces composed of
several smaller scales bound together. The slash is bright crimson.
=The Leaves= are borne on long, drooping, slender twigs, alternate, in
one plane and gradually diminishing in size from the base upwards. Each
such twig is supported by a larger leaf, 3½ inches long and 1¼ inches
broad. The alternate leaves vary from 3 inches long and ¾ inches broad
at the base of the twig to 2 inches long and ½ inch broad at the end of
the twig. The lateral veins, as they reach the margin, are continued
along it so that the edge is crenate. The tips are sharply pointed.
The leaves all point well forward. The ¼ inch long stalks are covered
with soft, brown hairs. The upper surface is slightly rough and darker
than the under surface, on which the veins, especially the laterals and
mid-rib, stand out prominently and show yellow in colour. The halves of
the leaf tend to fold up along the mid-rib slightly.
=The Flowers= are in very small clusters in the leaf axils and appear
in May and June. They are bright red in bud, the sepals being tinged.
Each male flower is ⅛ inch in diameter with a 5 sepal calyx, 5 minute
petals and a column of 5 radiating stamens. The female flower has 5
sepals, 5 petals, a disk round the ovary and 2 bifid styles.
Public-domain text, read in full here on John Shaqi.
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