Two new species of Sauropus are described, both endemic to Thailand. The two species have long, cauliflorous inflorescences. Sauropus discocalyx has very broad staminate flowers and S. thyrsiflorus has thyrsoid inflorescences with per node a single pistillate flower and cymes with staminate flowers. A new combination for Glochidion subterblancum C.E.C. Fisch. ( Breynia subterblancum (C.E.C. Fisch.) C.E.C. Fisch.) is made in Sauropus.