Oenothera hybrida var. ambigua (Nuttall) S. F. Blake

Oenothera hybrida var. ambigua (Nuttall) S. F. Blake 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.