NOTES RELATING TO FLORA OF HUNAN:Ⅱ. CARYOPHYLLACEAE,FAGACEAE, UM BELLIFERAE,RUBIACEAE, COMPOSITAE,ALISMATACEAE The Karyotypical Study on Sagittaria tengtsungensis H. Li——An Endemic Plant from China STUDIES ON THE POLLEN MORPHOLOGY OF ALISMATACEAE,HYDROCHARITACEAE,POTAMOGETONACEAE AND NAJADACEAE IN HUBEI PROVINCE THE GEOGRAPHICAL DISTRIBUTION OF ALISMATACEAE IN SOUTHWESTERN HUBEI Pollen Morphology of the Alismataceae Sagittaria lichuanensis — A Newly Recorded Species in Alismataceae from Guizhou Province Caldesia Parl., A New Record Genus of Alismataceae to Laos STUDIES ON THE PHYLOGENETIC RELATIONSHIPS OF CHINESE SAGITTARIA (ALISMATACEA) Production of male flowers does not decrease with plant size in insect-pollinated Sagittaria trifolia, contrary to predictions of size-dependent sex allocation Karyotypical Studies on Caldesia grandis Samuel., A Rare and Endangered Marsh Plant in China Flora Organogenesis of Ranalisma rostratum(Alismataceae)