Parrot's Feather, Water Feather, South American Water-milfoil: Myriophyllum aquaticum (Synonyms: Myriophyllum brasiliense, Myriophyllum proserpinacoides) - Non-native, naturalized.
Two-leaf Milfoil, Various-leaved Water-milfoil: Myriophyllum heterophyllum - Non-native.
Western Milfoil, WesternWater-milfoil: Myriophyllum hippuroides - Native.
Cutleaf Water-milfoil: Myriophyllum pinnatum - Native.
Andean Water-milfoil, Waterwort Water-milfoil: Myriophyllum quitense - Native.
American Milfoil, Common Water Milfoil, Northern Milfoil, Siberian Water-milfoil: Myriophyllum sibiricium (Synonyms: Myriophyllum exalbescens, Myriophyllum spicatum var. exalbescens) - Native.
Eurasian Water Milfoil, Spiked Water-milfoill: Myriophyllum spicatum (Synonym: Myriophyllum spicatum var. spicatum) - Non-native, naturalized.
Russian Water-milfoil, Terrestrial Water-milfoil, Ussurian Milfoil: Myriophyllum ussuriense - Native.
Verticillate Milfoil, Whorled Water-milfoil: Myriophyllum verticillatum (Synonym: Myriophyllum verticillatum var. pectinatum) - Native.