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Summary  Three new species of  Inversodicraea  (Podostemaceae),  I. senei  from the Memv’ele falls of the Ntem River, Cameroon,  I. tanzaniensis  from the Ruhudji River near Lupembe, Southern Highlands, Tanzania, and  I. botswana  from the Kasane rapids on the Chobe River, Botswana, are described and illustrated. All three species are known from single sites. All three are assessed as Critically Endangered using the IUCN standard. With 35 species,  Inversodicraea  is the most species-diverse genus of Podostemaceae in continental Africa, to which it is endemic. Four species of  Inversodicraea  are now known to be sympatric and point endemics at Memv’ele Falls in Cameroon where a hydro-electric dam is being constructed, threatening them with global extinction. Equally,  I. tanzaniensis  is threatened by proposed hydro-electric projects in Tanzania. In contrast,  I. botswana  is threatened by sewage discharge and also by bridge construction.

Three new Critically Endangered Inversodicraea (Podostemaceae) species from Tropical Africa: I. senei, I. tanzaniensis and I. botswana