Monoecious Plants of Myriophyllum ussuriense (Regel) Maxim. in Japan
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has been described as dioecious but monoecious plants were newly found from some populations in south-western Japan. Sex expression of monoecious plants proved labile and they sometimes bore male or female flowers alone. On the other hand, sex expression of dioecious plants was stable and seemed to be fixed genetically. M. ussuriense may be still in the course of differentiation from monoecy to dioecy.