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ADAPTIVE SIGNIFICANCE OF HERKOGAMY AND FLORAL BEHAVIOUR Floral syndrome and insect pollination of the Qinghai-Tibet Plateau endemic Swertia przewalskii（Gentianaceae） Pollination ecology of Aconitum gymnandrum (Ranunculaceae) at two sites with different altitudes Pollination ecology of alpine herb Meconopsis integrifolia at different altitudes DELAYED SELFING IN AN ALPINE SPECIES GENTIANOPSIS BARBATA INTRAFLORAL STAMEN DIFFERENTIATIONS AND THEIR ADAPTIVE SIGNIFICANCES Stamen movements in hermaphroditic flowers: diversity and adaptive significance Protogyny and delayed autonomous self-pollination in the desert herb Zygophyllum macropterum (Zygophyllaceae)