| Centaurea rothrockii Greenm., 1904 |
| Centaurea solstitialis L., 1753 |
| Centaureinae Dumort., 1827 |
| Centratherinae H. Rob., R.M. King & F. Bohlmann, 1980 |
| Centratherum Cass., 1817 |
| Centratherum punctatum Cass., 1817 |
| Centromadia Greene, 1894 |
| Centromadia parryi (Greene) Greene, 1894 |
| Centromadia parryi subsp. australis (D.D. Keck) B.G. Baldwin, 1999 |
| Centromadia perennis Greene, 1896 |
| Centromadia pungens (Hook. & Arn.) Greene, 1894 |
| Centromadia pungens subsp. laevis (D.D. Keck) B.G. Baldwin, 1999 |
| Centromadia pungens subsp. pungens (Hook. & Arn.) Greene, 1894 |
| Centrospermum Kunth, 1818 |
| Cephalophora Cav., 1801 |
| Cephalophora scaposa DC., 1836 |
| Ceratocephalus Cass., 1817 |
| Ceratocephalus americanus (L. f.) Kuntze, 1891 |
| Ceratocephalus beccabunga (DC.) Kuntze, 1891 |
| Ceratocephalus caespitosus Kuntze, 1891 |