Didymocarpus (Gesneriaceae) in Thailand

A taxonomic revision of Didymocarpus (Gesneriaceae) in Thailand has resulted in eighteen species. Three new species are described: Didymocarpus inflatus J.F.Maxwell & Nangngam, D. jaesonensis Nangngam & J.F.Maxwell, and D. payapensis Nangngam & J.F.Maxwell. A key to the Thai species, detailed descriptions, and notes on distribution, ecology, phenology, salient morphological traits, and illustrations are presented.