| Oenothera macrocarpa subsp. incana (A. Gray) W.L. Wagner, 1983 |
| Oenothera macrosceles A. Gray, 1849 |
| Oenothera maysillesii Munz, 1960 |
| Oenothera mckelveyae (Munz) W.L. Wagner & Hoch, 2007 |
| Oenothera mexicana Spach, 1835 |
| Oenothera micrantha Hornem. ex Spreng., 1825 |
| Oenothera missourensis Sims, 1813 |
| Oenothera montana Nutt., 1840 |
| Oenothera muelleri Munz, 1937 |
| Oenothera multicaulis Ruiz & Pav., 1802 |
| Oenothera octovalvis Jacq., 1760 |
| Oenothera orizabae W.L. Wagner, 2004 |
| Oenothera pallida Douglas ex Lindl., 1828 |
| Oenothera pennellii Munz, 1939 |
| Oenothera podocarpa (Wooton & Standl.) Krakos & W.L. Wagner, 2013 |
| Oenothera primiveris A. Gray, 1853 |
| Oenothera psychrophila Ball, 1885 |
| Oenothera pubescens Willd. ex Spreng., 1825 |
| Oenothera purpurea Curtis, 1796 |
| Oenothera purpusii Munz, 1932 |