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Genetic diversity of Pinus crassicorticea and its genetic relationship with two sympatric pine species Characteristics of Seeds and Hybrid Seeds in Three Sympatric Cypripedium Species Pre- and post-zygotic reproductive isolation between co-occurring Mussaenda pubescens var. alba and M. shikokiana (Rubiaceae) The Genetic and Morphological Evidence for Sympatric Speciation Pattern of Paris from Emei Mountain Pollination ecology of Gentiana siphonantha (Gentianaceae) and a further comparison with its sympatric congener species Variations in food habit and viscera organ morphology of four rodents in Shennongjia, central China null