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The Relations Among the Nectar Secretive Rhythms, Nectar Compositions and Diversities of Floral Visitors for Both Eleutherococcus senticosus and E.sessiliflorus Effects of position on nectar secretion and fruit set of Epimedium wushanense Effects of Flowering Period on Nectar Secretion and Fruit  Set of Epimedium wushanense (Berberidaceae) STUCIES ON THE ULTRASTRUCTURE AND MECHANISM OF NECTAR SECRETION IN FLORAL NECTARIES OF BRASSICA CAMPESTRIS LINN. AT DIFFERENT DEVELOPMENTAL STAGES STUDIES ON THE MORPHOLOGY AND THE ULTRASTRUCTURE OF THEMATURE FLORAL NECTARY OF NYMPHOIDES PELTATUM (GMEL) O. KUNTZ DURING THE NECTAR SECRETARY PERIOD Advances and Perspectives in Plant Nectaries Studies STRUCTURE AND ULTRASTRUCTURE STUDIES OF THE FLORAL NECTARY IN Codonopsis pilosula Nannf Advances and Perspectives in Plant Nectaries Studies