Saroj RuchisansakunPiyakaset SuksathanPramote TribounChalit SinrotthanakornMahidol UniversityThailand National Science and Technology Development AgencyNgao Waterfall National ParkBotanical Garden Organization2022-08-042022-08-042021-02-08Thai Forest Bulletin (Botany). Vol.49, No.1 (2021), 44-482465423X049538432-s2.0-85102262417https://repository.li.mahidol.ac.th/handle/20.500.14594/75729Impatiens tanintharyiensis (Balsaminaceae) is reported in Thailand for the first time from a population in Ngao Waterfall National Park, Ranong Province. This population differs from that at the type locality in Myanmar by having smaller, purple flowers (vs bigger purplish-pink flowers). An expanded description of this taxon and colour photographs are provided.Mahidol UniversityAgricultural and Biological SciencesArticleSCOPUS10.20531/TFB2021.49.1.04