Ngernsaengsaruay, Chatchai, Nisa Leksungnoen, Weereesa Boonthasak, Suwimon Utharatsamee, Phruet Racharak, Kantinan Leetanasakskul, Pornkanok Pongamorn, and Atcharaphan Saengbuapuean. 2022. “Additional Knowledge on the Genus Mitragyna (Rubiaceae) in Thailand”. Thai Forest Bulletin (Botany) 50 (1):20-39. https://doi.org/10.20531/tfb.2022.50.1.03.