Phylogenetic analysis of the nr ITS region indicates that several species of the genus Charpentiera, C. autralis of French Polynesia and C. obovata populations of Kaua’i and Moloka’i, have historically hybridized with Achyranthes mutica, endemic to Hawai’i and Kaua’i. Analysis of the plasmid psbA-trnH region suggests that Achyranthes served as the pollen donor and Charpentiera as the seed donor in the hybridization event likely occurring on...