Geographical Differentia tion for Seedling Growth and Morphology ofManglie tia yuyuanensis Provenances Seed geography: Its concept and basic scientific issues. Genetic structure and phylogeography of populations of Alsophila podophylla in Hainan and Guangdong, southern China, based on cpDNA trnL-F noncoding sequences Intraspecific Variation and Geographical Differentiation of Malus hupehensis Based on Exsiccate-specimen Analysis