Montane evergreen forests occur in river valleys and hollows. The south-facing slopes at the northwestern end of the range, which were formerly the Livingstone Forest Reserve and are now part of Kitulo National Park, have the most extensive areas of montane evergreen forest. The Ndumbi forest, at the eastern end of Kitulo National Park, has montane evergreen and East African Cedar ("Juniperus procera") forests. Thickets of bamboo ("Yushania alpina") can be found between the upper montane forests and the high altitude grasslands.