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The acanthaceous subfamily Thunbergioideae consist of around 170 species distributed widely throughout tropical and subtropical regions of the world. Of the five presently recognized genera (Scotland & Vollesen 2000), Thunbergia and Mendoncia contain almost all the species, ca. 100 and 60, respectively. Thunbergia is well represented in tropical and subtropical regions of Africa and Madagascar, Asia and Australia. The range of Mendoncia partially overlaps with that of Thunbergia, with a few species native to tropical Africa and Madagascar, but the greatest diversity is found in tropical America. The remaining genera are Pseudocalyx, with around 8 species in tropical Africa, and monotypic Anomacanthus (tropical Africa and Madagascar) and Meyenia (India and Sri Lanka).