This is tropical Africa's first Red Data book for plants. Cameroon contains tropical Africa's most species-diverse hotspots for plants; many are rare and threatened with extinction. In the book 815 species are documented as being threatened using IUCN global assessments, most being assessed for the first time. Since numerous species occur beyond Cameroon the new assessments are also relevant to Nigeria and Gabon, and as far west as Guinea and east to Congo and Rwanda-Burundi. Short species descriptions to aid identification in the field, and notes on habitats and threats are given, together with distribution maps and management suggestions to assist better conservation.