Beckmannia syzigachne subsp. baicalensis (I.V. Kusnezow) Hultén
Beckmannia syzigachne subsp. baicalensis (I.V. Kusnezow) Hultén is a synonym sensu FNA Ed. Comm., 2007 of:
Beckmannia syzigachne (Steudel) Fernald, an accepted species name sensu FNA Ed. Comm., 2007.