Micromorphological Characters of Seed Coats of Chinese Hydrocharitaceae and Their Systematic Significance Floral Organogenesis of Blyxa japonica (Hydrocharitaceae) Morphological Study of Fruit,Seed and Seedling Development of Ottelia alismoides (Hydrocharitaceae) Pollen morphology of 15 species in nine genera of the Hydrocharitaceae STUDIES ON THE POLLEN MORPHOLOGY OF ALISMATACEAE,HYDROCHARITACEAE,POTAMOGETONACEAE AND NAJADACEAE IN HUBEI PROVINCE A STUDY ON THE DYNAMIC CHANGES OF ISOZYMES IN PEROXIDASE ENZYMES BLYXA LEAF IN CHINA CLASSIFICATION AND DISTRIBUTION STUDIES ON HYDROCHARITACEAE FROM ZHEJIANG PROVINCE A Study on Seed Characters in Chinese Blyxa Chromosome Numbers and Karyotype Analysis of 9 Species in Hydrocharitaceae Microsatellites primer development for Ottelia acuminata(Hydrocharitaceae), a submerged macrophyte endemic to southwestern China