A plant survey in the Bismarckberge, the eastern extension of the Auas Mountains near Windhoek, during the rainy season 2014 increased the species list for the quarter degree square 2217CB by 35%. Although this quarter degree square falls within an area generally considered well covered floristically, the enrichment of the species list shows that dedicated plant surveys are well worth the effort, even in well-collected areas. The plant species recorded in the Bismarckberge can be considered a subset of the flora of the Auas Mountains, as no species were restricted to the Bismarckberge only. Keywords: biogeography, central highlands, mountain flora, savanna.