OBSERVATION ON VESSEL MEMBERS IN THE ADVENTITIOUS ROOT OF SAGITTARIA SAGITTIFOLIA L. Studies on Chemical Constituents of Sagittaria sagittifolia L. A PRELIMINARY STUDY ON THE SECRETORY DUCTS OF THE STOLON OF SAGITTARIA SAGITTIFOLlA L. A COMPARATIVE STUDY ONTHE KARYOTYPES IN ALISMA ORIENTALE AND SAGITTARIA SAGITTIFOLIA(ALISMATACEAE) Immunofluorescent Observation of Micro tubule Cytoskeleton in Root Tip Cells of Sagittaria sagittifolia L. A STUDY OF THE ORIGIN OF THE STOLON AND EXPANSION OF THE CORM OF SAGITTARIA SAGITTIFOLIA L.