Geographical distribution, Ethiopia, Sudan, South Sudan, Phytogeography, Botany, History of, Floras, Vegetation, Woodlands, Vegetation classification, and Woody plants
Coniferae, Botany, History of, Uses, Nomenclature, Vernacular names, Taxonomy, Conservation, Economic botany, Geographical distribution, Habitats, Ecology, Descriptions, and Identification
Geographical distribution, Plant collectors, Plant history, Orchidaceae, Ethnobotany, and Botany, History of