Children (6 direct children, 6 direct and indirect children):
Potamogeton perfoliatus var. richardsonii
Potamogeton perfoliatus var. bupleuroides
Potamogeton perfoliatus var. lacustris
Potamogeton perfoliatus var. minor
Potamogeton perfoliatus var. muelleri
Potamogeton perfoliatus var. perfoliatus