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ADAPTIVE SIGNIFICANCE OF HERKOGAMY AND FLORAL BEHAVIOUR Closure Behavior of the Touching-sensitive Stigmas in Flowering Plants and Its Adaptive Significance Autonomous Selfpollination under Dominant Flexistylous Outcorssing Mechanism in Alpinia galanga (Zingiberaceae) Autonomous Selfpollination under Dominant Flexistylous Outcorssing Mechanism in Alpinia galanga (Zingiberaceae)