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 Thorns= are in pairs, the upper ¾ inch long and straight, the
lower shorter and sharply recurved. They are a pale orange colour, and
they and the light grey twigs are covered with a fine pubescence. The
upper, straight thorn differs from that of _Z. Spina-Christi_ in being
set at near right-angles with the twig, not sharply inclined forward.
=The Wood= is pale red, in transverse section darker. The sapwood is
white. In transverse section the rings show clearly as white bands in
the red ground, the pores are small and single and the rays extremely
fine, invisible to the naked eye. In vertical section the pores are
fine, the grain indistinct. The wood is fairly hard, saws well and
planes readily without picking up, to a smooth finish which will
polish. A good sound wood with occasional knots.
=The Leaves= are about 1½ inches long and ¾ inch broad, are alternate
and assume one plane with the upper surface outwards. They are dark,
shiny green above, with whitish venation, and thickly covered with a
grey pubescence beneath. The veins are palmate, three spreading from
the base, raised beneath. The margins are very finely serrate.
=The Flowers= are in small axillary bunches and are downy, greenish,
with a flat, 5-pointed calyx, 5 minute petals, and 5 minute stamens and
a bifid stigma. The clusters are not so numerous or large as those of
the other species. They appear about January.
=The Fruits= are small, reddish drupes about ½ inch in diameter, with a
crisp, whitish flesh, which is sweet and edible, and a stone which is
very large for the size of the fruit. The fruit is smaller and drier,
and the stone rounder and larger in comparison with it, than those of
the other species, _Z. Spina-Christi_. It ripens about December.
=Uses.=—The fruits are eaten fresh.
[Illustration]
=ZIZYPHUS MUCRONATA= Willd.—_Magariyar kura_. RHAMNACEAE.
This species is a small, irregular-shaped tree not, as a rule, above 20
feet in height with a girth of 2-3 feet. It is quite commonly met with
as a shrub-like plant, some 10-12 feet high with straggling branches
forming a tangle. There may be two or three stems springing at ground
level from a common stock. The crown is open and uneven, and the long
drooping branches extend to within a few feet of the ground.
=The Bark= is grey, with long, coarse fissures and rough scales.
=The Thorns= are in pairs, the dorsal one long and straight, the lower
shorter and recurved. They are brown in colour.
=The Leaves= are dark, dull green, soft on the upper surface, grey and
densely covered with velvety hairs beneath. They are about 2 inches
long and 1½ inches wide, with short stalks and have finely serrate
edges, which the other species have not. The venation is 3-palmate and
raised on the under surface. They are borne alternately on the twigs,
with a tendency to assume one plane, the upper surface outwards.
Public-domain text, read in full here on John Shaqi.
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