Acacia stuhlmannii
The "Vlei Thorn" is confined in SA to the northern border region with Botswana. Young twigs, leaves and pods are covered with long hairs.
4 photos below: Plant near Soutpansberg, SA, 31.1.07; GPS readings: Elevation 842 m; S 23.01398 degr., E 029.26821 degr.