[Members of the Sunflower Family Having Daisy-like Flower Heads Found West of the Cascade Mountains of Oregon and Washington]

Butterweeds, Groundsels and Ragworts West of the Cascade Mountains of Oregon and Washington

The Genus Senecio

Inflorescence of White Western Groundsel, Western Groundsel: Senecio integerrimus var. ochroleucus

White Western Groundsel, Western Groundsel: Senecio integerrimus var. ochroleucus

Updated October 19, 2022

Butterweeds, Groundsels and Ragworts: The Genus Packera west of the Cascade Mountains

Butterweeds, Groundsels and Ragworts with discoid flower heads (lacking ray flowers)

Silver Ragwort: Jacobaea maritima - Introduced to Puget sound bluffs from the Mediterranean.

Stinking Willie, Tansy Ragwort: Jacobaea vulgaris (Synonym: Senecio jacobaea) -

Dwarf Mountain Groundsel, Dwarf Mountain Ragwort: Senecio fremontii var. fremontii -

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.

Columbia Ragwort, Lambstongue, Lambstongue Groundsel, Lambs-tongue Groundsel, One-stemmed Butterweed, Tall Western Groundsel: Senecio integerrimus var. exaltatus (Synonyms: Senecio integerrimus var. vaseyi, Senecio vaseyi) -

Bigheaded Groundsel: Senecio integerrimus var. major -

Western Groundsel, White Western Groundsel: Senecio integerrimus var. ochroleucus (Synonym: Senecio exaltatus ssp. ochraceus) -

Black-tipped Groundsel, Small Blacktip Ragwort: Senecio lugens (Synonym: Senecio integerrimus var. lugens) -

Olympic Mountain Ragwort: Senecio neowebsteri -

Wood Groundsel, Woodland Groundsel, Woodland Ragwort: Senecio sylvaticus -

Arrowleaf Groundsel, Arrowleaf Ragwort: Senecio triangularis (Synonyms: Senecio gibbonsii, Senecio triangularis var. angustifolius, Senecio triangularis var. triangularis) -

Sticky Groundsel, Sticky Ragwort: Senecio viscosus -


Paul Slichter E-mail