Gleasonia is a genus of plants in the Rubiaceae. There are at the present time (May 2014) five accepted species, all native to South America. \n* Gleasonia cururuensis Egler - Brazil \n* Gleasonia duidana Standl. - Brazil, Venezuela, Guyana \n* Gleasonia duidana var. duidana - Brazil, Venezuela \n* Gleasonia duidana var. latifolia Steyerm. - Brazil, Venezuela, Guyana \n* Gleasonia macrocalyx Ducke - Brazil \n* Gleasonia prancei B.M.Boom - Brazil \n* Gleasonia uaupensis Ducke - Brazil