Elegant Groundsel, Rayless Mountain Butterweed: Packera indecora (Synonym: Senecio indecorus) -
Rayless Alpine Butterweed, Rayless Alpine Groundsel: Packera pauciflora (Synonym: Senecio pauciflorus) -
Rayless Groundsel, Rayless Ragwort: Senecio aronicoides -
Stout Meadow Groundsel, Sweet Marsh Butterweed: Senecio hydrophiloides (Synonyms: Senecio foetidus, Senecio foetidus var. foetidus, Senecio foetidus var. hydrophiloides, Senecio oreganus) - Rays few in number. Flower heads may appear rayless.
Alkali Marsh Butterweed, Alkali Marsh Ragwort, Water Groundsel, Water Ragwort: Senecio hydrophilus (Synonym: Senecio hydrophilus var. pacifica) - Rays few in number. Flower heads may appear rayless.
Wood Groundsel, Woodland Groundsel, Woodland Ragwort: Senecio sylvaticus - Rays few in number. Flower heads may appear rayless.
Common Groundsel, Old Man-in-the-Spring: Senecio vulgaris -