Kneiffia fruticosa var. differta (Millspaugh) Millspaugh

Kneiffia fruticosa var. differta (Millspaugh) Millspaugh 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.