MJM: hairy like aquatica and has ovate, flat leaves with dentate margins, axillary flowers, male sterile M. verticillata L. from Tucker who collected it at Canal d Bourgogne, Dijon, France (Tucker: Intermediate between M. aquatica and M. arvensis). MJM - Hairy like aquatica and has ovate, flat leaves with dentate margins, axillary flowers, and is male sterile).