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Ngernsaengsaruay, C.; Leksungnoen, N. .; Boonthasak, W.; Utharatsamee, S.; Racharak, P.; Leetanasakskul, K.; Pongamorn, P.; Saengbuapuean, A. Additional Knowledge on the Genus Mitragyna (Rubiaceae) in Thailand. Thai Forest Bull., Bot. 2022, 50, 20-39.