In most places in the park, the pans are devoid of vegetation with the exception of halophytic Sporobolus salsus, a protein-rich grass that is eaten by grazers like blue wildebeest and springbok. The areas around the Etosha pan also have other halophytic vegetation including grasses like Sporobolus spicatus and Odyssea paucinervis, as well as shrubs like Suaeda articulata. Most of the park is savanna woodlands except for areas close to the pan. Mopane is the most common tree, estimated to be around 80% of all trees in the park. The sandveld of north-eastern corner of Etosha is dominated by acacia and Terminalia trees. Tamboti trees characterize the woodlands south of the sandveld. Dwarf shrub savanna occurs areas close to the pan and is home to several small shrubs including a halophytic succulent Salsola etoshensis. Thorn bush savanna occurs close to the pan on limestone and alkaline soils and is dominated by acacia species such as Acacia nebrownii, Acacia luederitzii, Acacia melliferra, Acacia hebeclada and Acacia tortilis. Grasslands in the park are mainly around the Etosha pan where the soil is sandy. Depending on the soil and the effects of the pan, grasslands could be dominated by one of the Eragrostis, Sporobolus, Monelytrum, Odyssea or Enneapogon species.