This field guide contains descriptions of 658 species of the larger trees found in Tanzania.
Moist forests are defined here as evergreen and semi-deciduous closed canopy vegetation that ranges from lowland groundwater and riverine forests to elfin mist forests on the tops of high mountains. A large tree is defined as being greater than 10 m or 20 cm diameter at breast height. The diameter measurement is included so that stunted trees in cold high elevation forests are covered. There are a great many trees smaller than 10 m in height, particularly in the family Rubiaceae. The height limit thus constrains the number of species included. A few species known only from the forests of eastern Kenya are included. This is to ensure full coverage of large trees from the Eastern Arc and Coastal Forest biodiversity "hotspot".