sentences:  The Pendjari park consists of; grasslands which have no trees or shrubs; shrub lands which are fully covered by grass; Arborous savanna vegetation; wooded savanna formations with contiherbaceous layer but with no undergrowth; forests along the river, thin forests with plenty of trees of size of 8–16 m; and gallery forests which are dense with shrubs.The rocky cliffs of the Pendjari National Park are sparsely wooded.The Volta depression has savanna ecosystem with woodlands and rare species such as "Burkea africana", Anogeissus leiocarpus, Pterocarpus erinaceus", Detarium microcarpum", "Lannea acida", "Sterculia setigera", "Combretum ghasalense" and "Acacia" spp.