Oenothera biennis var. pycnocarpa (G.F. Atkinson & Bartlett) Wiegand

Oenothera biennis var. pycnocarpa (G.F. Atkinson & Bartlett) Wiegand is a synonym sensu FNA Ed. Comm., 2021 of:

Oenothera biennis Linnaeus, an accepted species name sensu FNA Ed. Comm., 2021.