Packera is a genus of about 64 species of plants in the daisy family, Asteraceae. Most species are commonly called ragworts or grounsels. Its members were previously included in the genus Senecio (where they were called aureoid senecios by Asa Gray), but were divided out based on chromosome numbers, a variety of morphological characters, and molecular phylogeny. Species Packera anonyma (Wood) W.A. Weber & A. Löve − Small's ragwort Packera antennariifolia (Britt.) W.A. Weber & A. Löve − shalebarren ragwort Packera aurea (L.) A.& D. Löve − golden ragwort Senecio aureus L. Packera bernardina (Greene) W.A. Weber & A. Löve − San Bernardino ragwort Packera bolanderi (Gray) W.A. Weber & A. Löve − Bolander's ragwort Packera breweri (Burtt-Davy) W.A. Weber & A. Löve − Brewer's ragwort Senecio breweri Burtt-Davy Packera cana (Hook.) W.A. Weber & A. Löve − woolly groundsel Packera cardamine (Greene) W.A. Weber & A. Löve − bittercress ragwort Packera castoreus (Welsh) Kartesz, comb. nov. ined. − Beaver Mountain ragwort Packera clevelandii (Greene) W.A. Weber & A. Löve − Cleveland's ragwort Senecio clevelandii Greene Packera contermina (Greenm.) T.M. Barkl., comb. nov. ined. Packera crocata (Rydb.) W.A. Weber & A. Löve − saffron ragwort Packera cymbalaria (Pursh) W.A. Weber & A. Löve − dwarf arctic ragwort Packera cymbalarioides (Buek) W.A. Weber & A. Löve − cleftleaf groundsel Packera cynthioides (Greene) W.A. Weber & A. Löve − White Mountain ragwort Senecio cynthiodes Greene Packera debilis (Nutt.) W.A. Weber & A. Löve − weak groundsel Packera dimorphophylla (Greene) W.A. Weber & A. Löve − splitleaf groundsel Packera eurycephala (Torr. & Gray ex Gray) W.A. Weber & A. Löve − widehead groundsel Packera fendleri (Gray) W.A. Weber & A. Löve − Fendler's ragwort Packera flettii (Wieg.) W.A. Weber & A. Löve − Flett's ragwort Packera franciscana (Greene) W.A. Weber & A. Löve − San Francisco Peaks ragwort Senecio franciscanus Greene − San Francisco Peaks groundsel Packera ganderi (T.M. Barkl. & Beauchamp) W.A. Weber & A. Löve − Gander's ragwort Packera glabella (Poir) C. Jeffrey − butterweed Senecio glabellus Poir. Packera greenei (Gray) W.A. Weber & A. Löve − flame ragwort Packera hartiana (Heller) W.A. Weber & A. Löve − Hart's ragwort Packera hesperia (Greene) W.A. Weber & A. Löve − western ragwort Packera hyperborealis (Greenm.) A.& D. Löve − northern groundsel Packera indecora (Greene) A.& D. Löve − elegant groundsel Packera insulae-regalis R.R. Kowal − Isle Royale ragwort Packera ionophylla (Greene) W.A.