Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Roadsides, waste ground, lawns, and other disturbed, open sites.
Origin: Introduced from Europe
Conservation Status: Not of concern
Simple or strongly-branched, tap-rooted annual, 1-4 dm. tall.
Leafy throughout, the leaves coarsely and irregularly toothed to pinnatifid, 2-10 cm. long and 5-45 mm. wide, the lower tapering to a petiole, the upper sessile and clasping.
Heads many, strictly rayless, the flowers all tubular and perfect; disk usually 5-10 mm. wide; involucre 5-8 mm. high, the princeple bracts about 21, the bracteoles short but well-developed, black tipped; pappus copious.
Separate from the only other annual Senecio in our area by the number of involucre bracts (S. vulgaris has about 21, S. sylvaticus,13), the bracteoles (only S. vulgarisÃ† are black-tipped) and the aroma (only S. sylvaticus is malodorous).