Calylophus serrulatus var. spinulosus (Torrey & A. Gray) Shinners

Calylophus serrulatus var. spinulosus (Torrey & A. Gray) Shinners is a synonym sensu FNA Ed. Comm., 2021 of:

Oenothera serrulata Nuttall, an accepted species name sensu FNA Ed. Comm., 2021.