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Notes on the genus Clematis (Ranunculaceae) (Ⅲ) The Analysis of Distribution Pattern in the Paeoniaceae and Its Formation The Geography of the Campanulaceae: On the Distribution Centres A new system of classification of the genus Clematis (Ranunculaceae) COMBINATIVE PATTERNS OF CONSTITUENT CELLS OF LEAF EPIDERMIS OF POACEAE AND THEIR TAXONOMIC SIGNIFICANCE Pollen Morphology and Epidermal Characters of Leaves in Convallarieae (s. l.) Cytological Investigation of Taiwania flousiana Gaussen (Taxodiaceae) Analysis on the evolutionary trends of regional agrometeorological disasters in China The Geographical Distribution and the System of Aristolochiaceae Pollen Morphology and Evolutionary Trend in Polygonum multiflorum Thunb.Germplasms