Haplopappus phyllocephalus var. rubiginosus (Torr. & A.Gray) S.F.Blake accepted as Haplopappus rubiginosus Torr. & A.Gray (original description)
Haplopappus spinulosus var. glaberrimus (Rydb.) S.F.Blake accepted as Xanthisma spinulosum var. glaberrimum D.R.Morgan & R.L.Hartm. (original description)
Haplopappus spinulosus var. scabrellus (Greene) S.F.Blake accepted as Ericameria nauseosa var. ammophila L.C.Anderson (original description)
Haplopappus spinulosus var. turbinellus (Rydb.) S.F.Blake accepted as Xanthisma spinulosum (Pursh) D.R.Morgan & R.L.Hartm. (original description)
Haplopappus stoloniferus var. genuinus S.F.Blake accepted as Osbertia stolonifera (DC.) Greene (original description)
Haplopappus stoloniferus var. heleniastrum S.F.Blake accepted as Osbertia stolonifera (DC.) Greene (original description)