Saraca thailandica Pongamornkul, Panyadee & Inta, anew species from northern Thailand, is described and illustrated. This riparian species is distinguishable by its large bracteoles which erect and clasping the calyx tube. It also has 7 stamens which is rarely found in previous known Saraca species. Its flowering and fruiting period is August to September and December to March, respectively, which is different from S. dives and S. thaipingensis. The additional key for Saraca in Thailand is also provided.