a Phylogenetic relationships in genus Gastrochilus based on nrDNA ITS and plastid matK, trnL-trnF, psbA-trnH, psbM-trnD sequences. ML and BI trees have the same topology and BP and PP are given beside the branches b phylogenetic relationships of Gastrochilus based on the complete plastomic sequences. All nodes are supported with a posterior probability (pp) of 1.0. “*” indicates 100% bootstrap support c phylogenetic tree based on combined nrITS and plastid DNA markers and conflicting topologies (clade B and clade F) are highlighted.