Myriophyllum L.
Aquatic plants or growing on mud. Petals absent in female flowers Myriophyllum
At least submerged leaves whorled or opposite
At least submerged leaves in whorls of 3–8
Emerged leaves thick, flat or compressed, lanceolate to narrow-elliptic or ovate to oblong
Emerged leaves lanceolate to narrow-elliptic, 15–45 mm long, dentate; submerged leaves finely dissected. Coast and adjacent plateaus; Cumberland Plain. Still water in ponds and lakes Myriophyllum latifolium