The leaves of Senegalia senegal var. leiorhachis grow in threes or fours from the nodes, sometimes cushioned. The bipinnate leaves bear three to eight pairs of pinnae, each with 7 to 25 leaflets. The leaflets are oblong with slightly rounded to obtusely pointed tips. Leaflet colour is blue-green, the young ones in picture yellowish green.
The leaflets seen here angle up and forward. The petiole (and rachis?) are hairy, the leaflets not. The petiole usually has a gland present; small glands often also at the base of upper pinnae pairs.
The cream-coloured catkin flowers of this tree grow from leaf axils. They are 3 cm to 8 cm long and up to 2,2 cm in diameter. The catkin stalks are hairless. Flowering occurs in winter and early spring.
The fruit is a straight, flat pod about 9 cm long and 2 cm wide. It is khaki to pale brown, dehiscent when ripe (Coates Palgrave, 2002; Van Wyk and Van Wyk, 1997; Schmidt, et al, 2002; iNaturalist).