Hydrilla verticillata

MuM, VRiv, MuF, GipP. All mainland States. Naturalized in south-east North America. Recorded from scattered localities along the Murray River between Yarrawonga and Mildura, and possibly occurring further downstream (Aston 1973). In still to slow-flowing freshwater of lakes and streams, to a depth of at least 3.5 m. Male flowers recorded in May.