Single gene analyses reveal potential cases of horizontal gene transfer of atp1 from host to parasite. Comparison of phylogenetic relationships, gene-specific branch lengths (drawn proportionally) and corrected pairwise divergences (K) for representatives of all rosid and asterid orders for the three mt genes, atp1, matR, and coxI. Endoparasites and their host lineages are shown in matching colors. BP/PP values are shown above all nodes with values >50/0.8. A. Single most likely tree from atp1-only analysis (-lnL = 5136.56). B. Single most likely tree from matR-only analysis (-lnL = 8443.48). C. Single most likely tree from coxI-only analysis (-lnL = 4426.50). D-F. Average pairwise divergences for the endoparasite taxa relative to all non-parasites in the atp1, matR, and coxI datasets, respectively. Calculations of pairwise divergences shown in D-F, were made by comparing each single endoparasite to all non-parasites and all non-parasites to each other.