| Eupatorium calderonii B.L. Turner, 1989 |
| Eupatorium calophyllum (Greene) B.L. Rob., 1925 |
| Eupatorium campechense B.L. Rob., 1907 |
| Eupatorium campylocladum B.L. Rob., 1904 |
| Eupatorium canescens Ortega, 1797 |
| Eupatorium capillipes Benth., 1853 |
| Eupatorium capnoresbium B.L. Rob., 1900 |
| Eupatorium cardiophyllum B.L. Rob., 1900 |
| Eupatorium carletonii B.L. Rob., 1924 |
| Eupatorium carmonis Standl. & Steyerm., 1940 |
| Eupatorium carnosum Kuntze, 1891 |
| Eupatorium celtidifolium Lam., 1788 |
| Eupatorium ceriferum McVaugh, 1972 |
| Eupatorium chapalense S. Watson, 1891 |
| Eupatorium chiapense B.L. Rob., 1900 |
| Eupatorium choricephalum B.L. Rob., 1918 |
| Eupatorium chrysostyloides B.L. Rob., 1907 |
| Eupatorium chrysostylum B.L. Rob., 1905 |
| Eupatorium ciliatum Less., 1831 |
| Eupatorium coahuilense A. Gray, 1882 |