Potamogeton pusillus var. gemmiparus J.W. Robbins

Potamogeton pusillus var. gemmiparus J.W. Robbins is a synonym sensu FNA Ed. Comm., 2000 of:

Potamogeton berchtoldii subsp. gemmiparus (J.W. Robbins) Les & Tippery, an accepted subspecies name sensu Les et al., 2009.