South American Water Milfoil, Parrot's Feather, Parrot Feather Water-milfoil, Water Feather: Myriophyllum aquaticum (Synonym: Myriophyllum brasiliense)
Andean Watermilfoil, Andean Water-milfoil, Waterwort Milfoil, Waterwort Water Milfoil: Myriophyllum quitense (Synonym: Myriophyllum elatinoides)
American Milfoil, Common Water Milfoil, Northern Water-milfoil, Shortspike Water-milfoil, Siberian Water-milfoil: Myriophyllum sibiricum (Synonyms: Myriophyllum exalbescens, Myriophyllum spicatum var. exalbescens)
Eurasian Watermilfoil, Eurasian Water Milfoil, Eurasian Water-milfoil, Spike Water-milfoil, Spiked Water Milfoil: Myriophyllum spicatum var. spicatum
Whorled Water Milfoil, Whorl-leaf Water-milfoil, Verticillate Water-milfoil: Myriophyllum verticillatum (Synonym: Myriophyllum verticillatum var. pectinatum)