ITS1 and ITS2 sequences analysis of seven medicinal plants in Polygala L. Molecular Evidence for the Hybrid Origin of Bauhinia blakeana (Caesalpinioideae) ITS1 sequences variation and phylogenetic analysis on five geographical stocks of Coelomactra antiquata ITS1 Sequences of Nuclear Ribosomal DNA in Wild Rices and Cultivated Rices of China and Their Phylogenetic Implications Identification of plants in Fritillariae L. by DNA barcoding technology ITS1 and ITS2 Sequences of Four Possible Donors to Bread Wheat Genome and Their Phylogenetic Relationships