Parthenium alpinum var. typicum Rollins (original description)
Parthenium bipinnatifidum (Ortega) Rollins accepted as Parthenium hysterophorus L. (original description)
Parthenium cineraceum Rollins (original description)
Parthenium confertum var. divaricatum Rollins accepted as Parthenium confertum A.Gray (original description)
Parthenium confertum var. lyratum (A.Gray) Rollins (original description)
Parthenium confertum var. microcephalum Rollins (original description)
Parthenium confertum var. typicum Rollins (original description)
Parthenium fruticosum var. trilobatum Rollins (original description)
Parthenium fruticosum var. typicum Rollins (original description)
Parthenium glomeratum Rollins accepted as Parthenium hysterophorus L. (original description)
Parthenium hispidum var. auriculatum (Britton ex Britton) Rollins accepted as Parthenium integrifolium L. (original description)
Parthenium hispidum var. typicum Rollins (original description)
Parthenium tomentosum var. stramonium (Greene) Rollins (original description)
Parthenium tomentosum var. typicum Rollins (original description)