Myriophyllum verticillatum subsp. pectinatum (Wallroth) Piper & Beattie nom. illeg.
Myriophyllum verticillatum subsp. pectinatum (Wallroth) Piper & Beattie nom. illeg. is a synonym sensu FNA Ed. Comm., 2021 of:
Myriophyllum verticillatum Linnaeus, an accepted species name sensu FNA Ed. Comm., 2021.