Molecular Systematics of Genus Viola L. in China A taxonomic re-assessment in the Chinese Bupleurum (Apiaceae): Insights from morphology, nuclear ribosomal internal transcribed spacer, and chloroplast (trnH-psbA, matK) sequences Exploring the utility of three nuclear regions to reconstruct reticulate evolution in the fern genus Asplenium A new orchid Paphiopedilum guangdongense and its molecular evidence Phylogenetic position of the genus Dobinea: Evidence from nucleotide sequences of the chloroplast gene rbcL and the nuclear ribosomal ITS region