Maximum Likelihood (ML) phylogenetic tree of Trimeresurus from the analysis of 12S rRNA, 16S rRNA, ND4, and cyt b mitochondrial DNA gene sequences. Part 1 (subgenus Popeia). For voucher specimen information and GenBank accession numbers see Appendix II. Numbers at tree nodes correspond to ML UFBS / BIPP support values, respectively; an en-dash denotes no support. Colors of clades and locality numbers given in brackets after specimen ID correspond to those in Figure 1 and Figure 3. Bold letters A–F on the branches correspond to the main mtDNA clades revealed by our analysis (see Results). Photos showing two new species described herein by N.A. Poyarkov and P. Pawangkhanant.