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Summary  We present a synopsis and an identification key for the 13 species and one subspecies of the African genus  Whitfieldia  Hook. (Acanthaceae: Acanthoideae: Whitfieldieae). This work is based on the observation and analysis of morphological data from herbarium specimens and photographs of  Whitfieldia  species, and the study of all the relevant literature on the genus.  Whitfieldia latiflos  C.B.Clarke ex Stapf from Liberia is reinstated as an accepted species and a full description and illustration are provided. A new subspecies,  W. colorata  C.B.Clarke ex Stapf subsp.  tigrina  A.Grall &amp; I.Darbysh., also from Liberia, is described. In addition,  W. arnoldiana  De Wild. &amp; T.Durand and  W. letestui  Benoist are treated as synonyms of  W. laurentii  (Lindau) C.B.Clarke and  W. preussii  (Lindau) C.B.Clarke respectively for the first time. Eleven names in  Whitfieldia  are lectotypified. Reference specimens, relevant literature, habitat notes, distribution maps, taxonomic notes and a preliminary assessment of the conservation status and extinction risk are provided for each taxon. Four species are considered to be threatened of which two ( W. latiflos  and  W. rutilans  Heine) are assessed as Endangered (EN) while two others ( W. purpurata  (Benoist) Heine and  W. thollonii  (Baill.) Benoist) are placed in the Vulnerable (VU) category. In addition, two taxa are assessed as Near Threatened (NT) and one is currently considered to be Data Deficient (DD).

A synopsis of the African genus Whitfieldia (Acanthaceae: Whitfieldieae) and a key to the species