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Three new species of Piperaceae, Piper dominantinervium A. Chaveerach & P. Mokkamul, P. pilobracteatum A. Chaveerach & R. Sudmoon from southern Thailand, and P. phuwuaense A. Chaveerach & T. Tanee from northeastern Thailand, are described and illustrated. P. phuwuaense is considered rare and endemic to Phu Wua Wildlife Sanctuary. Morphological differences between the new species and related taxa are discussed.