| Chylismia claviformis (Torr. & Frém.) A. Heller, 1906 |
| Circaeeae Dumort., 1827 |
| Clarkia Pursh, 1814 |
| Clarkia delicata (Abrams) A. Nelson & J.F. Macbr., 1918 |
| Clarkia epilobioides (Nutt. ex Torr. & A. Gray) A. Nelson & J.F. Macbr., 1918 |
| Clarkia purpurea (Curtis) A. Nelson & J.F. Macbr., 1918 |
| Clarkia rhomboidea Douglas, 1832 |
| Clarkia unguiculata Lindl., 1840 |
| Diplandra Hook. & Arn., 1838 |
| Diplandra lopezioides Hook. & Arn., 1838 |
| Ellobium (Lilja) Breedlove, P.E. Berry & P.H. Raven, 1982 |
| Encliandra (Zucc.) Lindm., 1838 |
| Epilobieae Endlicher, 1830 |
| Epilobium L., 1753 |
| Epilobium angustifolium L., 1753 |
| Epilobium bonplandianum Kunth, 1823 |
| Epilobium canum (Greene) P.H. Raven, 1977 |
| Epilobium canum subsp. angustifolium (D.D. Keck) P.H. Raven, 1977 |
| Epilobium canum subsp. latifolium (Hook.) P.H. Raven, 1977 |
| Epilobium ciliatum Raf., 1808 |