Genotypic diversity and genetic structure of populations of the distylous aquatic plant Nymphoides peltata (Menyanthaceae) in China Advances in the research of heterostyly Microsporogenesis and Male Gametophyte Development of Long-style Flower of Luculia pinciana(Rubiaceae) Effects of Population Size on Reproductive Success of the Endangered and Endemic Species Primula merrilliana Distyly and Pollination Biology of Dunnia sinensis (Rubiaceae) Floral morph distribution in China and autogamy of an invasive species: Oxalis corniculata (Oxalidaceae)