| Parthenice mollis A. Gray, 1853 |
| Parthenice mollis var. mollis A. Gray, 1853 |
| Parthenice mollis var. peninsularis Sauck, 1975 |
| Parthenium L., 1753 |
| Parthenium arctium Bartlett, 1909 |
| Parthenium argentatum A. Gray, 1859 |
| Parthenium bipinnatifidum (Ortega) Rollins, 1950 |
| Parthenium confertum A. Gray, 1882 |
| Parthenium confertum var. confertum A. Gray, 1882 |
| Parthenium confertum var. lyratum (A. Gray) Rollins, 1950 |
| Parthenium confertum var. microcephalum Rollins, 1950 |
| Parthenium densipilum S.F. Blake, 1924 |
| Parthenium fruticosum Less. ex Schltdl. & Cham., 1830 |
| Parthenium fruticosum var. fruticosum Less. ex Schltdl. & Cham., 1830 |
| Parthenium fruticosum var. trilobatum Rollins, 1950 |
| Parthenium hysterophorus L., 1753 |
| Parthenium hysterophorus var. lyratum A. Gray, 1882 |
| Parthenium incanum Kunth, 1818 |
| Parthenium lloydii Bartlett, 1916 |
| Parthenium lozanoanum Bartlett, 1909 |