Introduction This article summarizes the molecular phylogeny and taxonomic notes for Premna (Lamiaceae) in Thailand, based on a multi-locus chloroplast approach. Utilizing four chloroplast markers and concatenated datasets, the study delineates phylogenetic relationships among Thai Premna species, highlights unresolved polytomies, and revisits trusted species concepts within the P. serratifolia complex. Phylogenetic reconstruction Using a multi-locus…