Psychotria poeppigiana is a plant species in the family Rubiaceae; a common name is sore-mouth bush, though it is not very often used. It ranges widely in the tropical Americas, from Chiapas, Oaxaca, Tabasco and Veracruz in Mexico to the very north of Argentina. It does not occur on the Pacific side of the American cordillera however, and is thus absent from El Salvador and Chile. It is probably also absent from Uruguay and Paraguay.