| Megapterium brachycarpum (A.Gray) Rydb. | Oenothera brachycarpa A.Gray sect. Megapterium |
| Megapterium canescens (Torr. & FrĂ©m.) Britton | Oenothera canescens Torr. & Frém. sect. Gauropsis |
| Megapterium dissectum (A.Gray ex S.Watson) Small | Oenothera dissecta A.Gray ex S.Watson sect. Leucocoryne |
| Megapterium macrocarpum (Nutt.) R.R.Gates | Oenothera macrocarpa Nutt. sect. Megapterium |