Minimum-spanning network based on the mutational steps between haplotypes of nrDNA in the populations of Rhododendron pseudochrysanthum s.l. Major clusters A, B and C are indicated. FR: R. formosanum. HR: R. hyperythrum. PR: R pseudochrysanthum s.l.; Symbols: Alishan Mountain Range (blank circle), Central Mountain Range (black circle), Sheishan Mountain Range (blank square), and Yushan Mountain Range (black square). Branches represent single mutational changes, and black squares represent multiple changes (indicated by adjacent numbers). Circle sizes are proportional to the haplotype's frequency.