A small, erect tree up to some 25 feet in height with 1-2 feet girth, locally very plentiful but otherwise infrequent, _e.g._, in the Anka district of Sokoto it occurs in vast numbers, but nowhere else in the province, and in one or two places in Bauchi small clumps of it are seen. At first sight it is very like an _Acacia_, with its erect branches and pinnate leaves. The stem branches generally low down, occasionally at a height of 8-10 feet, and the branches are vertical, so that the tree has no width of crown. Owing to the scarcity of the smaller branches the vertical ones are crowded with leaves, and from February to April with flowers, for several feet, there being no side twigs, these being replaced by small shoots covered with bracts. =The Bark= is silvery grey with a soft sheen, smooth and very thick, large scales peeling off in season. The effect of fire on young stems is to produce great bosses of light brown cork, often charred. The slash is yellow. =The Leaves= are about 2-3 inches long, pinnate, with some 6-8 opposite or sub-opposite leaflets and a terminal leaflet. These are ¼-⅜ inch long and about ³⁄₁₆ inch broad, oval, with or without a slightly notched tip in which the mid-rib protrudes slightly. They are grey-green and hairy and each springs from between a pair of bracts on the twig. =The Flowers= are very handsome “Pea-flowers” in small clusters on long stalks, branched, with a bract at each branch, springing from small clusters of bracts on the woody stems. The stalks are purple and hairy, the calyx is irregular, purple and green, and the corolla is a delicate pink with a pale green keel. The flowers are generally in great masses and a curious characteristic is that they dry up and retain almost their original shape, the pod ripening meanwhile. =The Fruits= are small black jointed pods 1-1½ inches long with some 4-5 joints, oval, flattened and hairy, each containing one seed, pale brown in colour. The pod will often bend right round and its tip enter the mouth of the flower. [Illustration] =OSTRYODERRIS CHEVALIERI= Dunn.—_Durbi_. LEGUMINOSAE. A large tree some 40 feet or more high, common in some parts of Sokoto, Zaria and Katsina, but very local in its occurrence and extending as far north as 13°. The girth is up to 7 feet, more often 5 feet. It closely resembles _Paradaniellia Oliveri_ in bark and leaf and form, especially in young trees of the latter species. The bole may be clean and straight for 20 feet and the crown is high and flat-topped in full grown trees. It does not grow on poor soils and its extension to 13° is by way of moister valleys and pockets of alluvial soil. The pods and flowers are the distinctive features.