Kneiffia tetragona var. hybrida (Michaux) Pennell
Kneiffia tetragona var. hybrida (Michaux) Pennell is a synonym sensu FNA Ed. Comm., 2021 of:
Oenothera fruticosa subsp. tetragona (Roth) W.L. Wagner, an accepted subspecies name sensu FNA Ed. Comm., 2021.