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Pollination ecology of Gentiana straminea Maxim. (Gentianaceae), an alpine perennial in the Qinghai-Tibet Plateau Floral Syndrome and Insect Pollination of Liriodendr on chinense Pollination Biology of Endangered Elaeagnus mollis Diels Population A study on the attractive function of different floral structures in Trollius ranunculoides (Ranunculaceae)