[Butterweeds, Groundsels and Ragworts: The Genus Senecio West of the Cascade Mountains of Oregon and Washington]

Arrowleaf Groundsel, Arrowleaf Ragwort

Senecio triangularis

Synonyms: Senecio gibbonsii, Senecio triangularis var. angustifolius, Senecio triangularis var. triangularis

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

Arrowleaf groundsel as seen in a moist ditch along the Hurricane Ridge Road about one mile east of the Hurricane Ridge Visitor Center in Olympic National Park........July 25, 2008.
Paul Slichter