The vegetation of Bombo Lumene is characterized by open, wooded savanna, as well as dense riparian gallery forests and small forested patches. Its wooded savannas are dominated by species such as Hymenocardia acida, Crossopteryx febrifuga, Annona senegalensis, Vitex madiensis, while the open savannas are dominated primarily by Loudetia demeusii, Ctenium newtonii, and Laudelphia lanceolata. In the flooded savannas, marshes, and wetlands, a wide variety of orchids can be found, the most common being the hooded harlequin orchid (Eulophia cucullata). Other interesting plants found in these areas include carnivorous sundews (Drosera), which “feed” on small insects to compensate for the poor quality of the soil in which they grow. Gallery forests are found mainly in the steep valleys formed by the Bombo and Lumene Rivers. They contain a wide diversity of tropical plant species similar to those found deep within the tropical rainforest of the Congo Basin. These forests are also the only places where remnants of ancient trees can still be found.