抄録
Phylogenetic trees of Peperomia subg. Micropiper based on nuclear internal transcribed spacer (ITS) and eight plastid DNA regions to evaluate the congruence of their topologies and to assess section-equivalent groups that were previously proposed based on a plastid phylogenetic tree are reported. The results revealed two obvious incongruences related to section-equivalent groups between the nuclear and plastid trees at the levels of the phylogenetic position of Glabelloid group and the monophyly of Blandoid group. The cause of the former incongruence was estimated to be hybridization (chloroplast capture) because the common morphological characteristics were shared by plants in the clade supported by the nuclear tree. The latter incongruence also appears to have been caused by hybridization. Unusually, however, the morphological characteristics supported the clade in the plastid (not nuclear) tree. The section-equivalent groups were also confirmed by the nuclear tree except for the Blandoid group, which was split at into two groups (P. blanda, including P. leptostachya, and other species). Peperomia tuisana, which previously remained outside the groups, is a dubious species and may be a hybrid origin.
