Senecio aquariensis Greenm. (original description)
Senecio aureus var. semicordatus (Mack. & Bush) Greenm. accepted as Packera pseudaurea var. semicordata (Mack. & Bush) Trock & T.M.Barkley (original description)
Senecio conterminus Greenm. accepted as Packera contermina (Greenm.) J.F.Bain (original description)
Senecio cymbalarioides var. borealis (Torr. & A.Gray) Greenm. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve (original description)
Senecio cymbalarioides var. streptanthifolius (Greene) Greenm. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve (original description)
Senecio fernaldii Greenm. accepted as Packera cymbalaria (Pursh) W.A.Weber & Á.Löve (original description)
Senecio flavovirens var. thomsoniensis (Greenm.) Greenm. (original description)
Senecio gaspensis Greenm. accepted as Packera paupercula (Michx.) Á.Löve & D.Löve (original description)
Senecio hollickii Britton ex Greenm. accepted as Odontocline hollickii (Britton ex Greenm.) B.Nord. (original description)
Senecio obovatus var. divisifolius Greenm. (original description)
Senecio pammelii Greenm. (original description)
Senecio quebradensis Greenm. (original description)
Senecio rubricaulis var. aphanactis Greenm. (original description)