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 a foot long with 5-7 leaflets, the terminal longest,
the lowest pair shortest. They are grey-green and waxy to the touch and
with the exception of the mid-rib the venation is raised on the upper
and not on the lower surface. They are 3-4 inches long and tapering to
both ends.
=The Flowers= are in numerous panicles at the twig ends, a mass of
purple at first erect, then drooping. The panicles are up to a foot
long and the flowers are papilionaceous with a white splash on the
face of the standard petal. The calyx is dark purple. They appear from
January to March and are fertilised by bees, flies and wasps and other
insects.
=The Fruits= are pods, from 2-5 inches long according to the number
of seeds, generally 2, rarely 3, and an inch in width. They are flat,
light brown or whitish in colour, in pendulous masses, very conspicuous
and the seeds are chestnut brown, ½ inch long, shiny, flat and with a
deeply indented hilum. They remain on the tree for a long time.
=Uses.=—An infusion of the roots with water is used as a tonic.
[Illustration]
=LOPHIRA ALATA= Banks.—_Namijin Kadai, Mijin Kadai_. “_Meni Oil Tree_.”
DIPTEROCARPACEAE.
This is one of the type species of the tree savannah and strongly
resembles at first sight the Shea, since both have strap-shaped
leaves. This is the only close resemblance and even they are easily
distinguished from one another, see below. It attains a height of some
40 feet with a girth up to 6 feet, and has a tall, regular, rather
open crown occupying at least two-thirds of the height and often more.
The branches ascend at an acute angle to the stem so that the form is
narrowed, another distinguishing feature between it and the Shea. It
prefers good deep soils and its northern limit is about 12° N.
=The Bark= is light grey with even-sized scales 1-2 inches long, 1 inch
wide and ¼ inch thick. That of the smaller branches is softly corky.
The scales are not prominent, nor is there a milky sap, two other
features distinguishing it from the Shea. The slash is crimson with
bright yellow edges.
=The Wood= is a dull reddish-brown. The transverse section shows
indistinct light rings, close together, the pores small and scattered
singly and widely throughout the hard and soft tissue which is clearly
separated in thin, wavy concentric dark and light lines. The rays are
exceedingly fine and invisible to the naked eye. In vertical section
the pores show as if filled with some chalky matter and the grain is
straight with the hard and soft tissue marked in fine lines, and the
rays as numerous small bands in radial section. The wood is hard to saw
and plane, picking up in places, but elsewhere finishes smooth. It is
tough and strong and weighs 65 lbs. a cubic foot.
Public-domain text, read in full here on John Shaqi.
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