Ecological and Biological Characteristics and Cutting Propagation of Hydrocotyle nepalensis Hook New Taxa of Umbelliferae from China Hydrocotyle shanii Boufford, a New Name for H. chinensis of Authors, Not L. (Apiaceae) Diurnal photosynthetic changes of Hydrocotyle vulgaris in the ecological ditch The effects of habitat type and nitrogen deposition on the invasion of Hydrocotyle vulgaris in wetland plant communities A study of anatomical structure and apoplastic barrier characteristics of Hydrocotyle sibthorpioides