| Camissoniopsis cheiranthifolia (Hornem. ex Spreng.) W.L. Wagner & Hoch, 2007 |
| Camissoniopsis guadalupensis (S. Watson) W.L. Wagner & Hoch, 2007 |
| Camissoniopsis guadalupensis subsp. guadalupensis (S. Watson) W.L. Wagner & Hoch, 2007 |
| Camissoniopsis hirtella (Greene) W.L. Wagner & Hoch, 2007 |
| Camissoniopsis ignota (Jeps.) W.L. Wagner & Hoch, 2007 |
| Camissoniopsis intermedia (P.H. Raven) W.L. Wagner & Hoch, 2007 |
| Camissoniopsis lewisii (P.H. Raven) W.L. Wagner & Hoch, 2007 |
| Camissoniopsis micrantha (Hornem. ex Spreng.) W.L. Wagner & Hoch, 2007 |
| Camissoniopsis pallida (Abrams) W.L. Wagner & Hoch, 2007 |
| Camissoniopsis proavita (P.H. Raven) W.L. Wagner & Hoch, 2007 |
| Camissoniopsis robusta (P.H. Raven) W.L. Wagner & Hoch, 2007 |
| Campogaura (P.H. Raven & D.P. Greg) W.L. Wagner & Hoch, 2007 |
| Caryophylloidea P.H. Raven, 1963 |
| Chamerion (Raf.) Raf. ex Holub, 1972 |
| Chamerion angustifolium (L.) Holub, 1972 |
| Chylismia (Torr. & A. Gray) Nutt. ex Raim., 1893 |
| Chylismia arenaria A. Nelson, 1934 |
| Chylismia cardiophylla Small, 1896 |
| Chylismia claviformis (Torr. & Frém.) A. Heller, 1906 |
| Circaeeae Dumort., 1827 |