Genotypic diversity and genetic structure of populations of the distylous aquatic plant Nymphoides peltata (Menyanthaceae) in China Maintenance of genetic diversity in a small, isolated population of ancient tree Erythrophleum fordii The mitochondrial DNA nad1 sequence variation of Picea crassifolia(Pinaceae) in the Qinghai-Tibetan Plateau platform and adjacent populations Phylogeography of Juniperus przewalskii (Cupressaceae) inferred from the chloroplast DNA trnT-trnF sequence variation Allozyme Diversity and Population Differentiation in an Endangered Plant,Ammopiptanthus nanus(Leguminosae) Effects of deforestation on the genetic structure of Castanopsis sclerophylla