 Species of acacia are the dominant trees, with "Acacia tortilis" the most common, along with "Acacia senegal" and "Acacia laeta".Other tree species include "Commiphora africana", "Balanites aegyptiaca", "Faidherbia albida", and "Boscia senegalensis".In the northern part of the Sahel, areas of desert shrub, including "Panicum turgidum" and "Aristida sieberana", alternate with areas of grassland and savanna.