Strong-scented annual 1–6 dm from a taproot, copiously and conspicuously glandular-hairy throughout; lvs equably distributed, pinnatifid and toothed, 3–12 × 1–5 cm, the lower petiolate; heads less crowded than in nos. 17 [Senecio sylvaticus L.] and 19 [Senecio vulgaris L.], the disk 7–15 mm wide; invol 6–8 mm, with ca 21 or seldom only 13 principal bracts and generally a few well developed but not black-tipped bracteoles; rays short but evident and loosely spreading in life, in herbarium specimens becoming rather circinate and inconspicuous, scarcely exceeding the pappus, which generally surpasses the disk-fls; achenes glabrous or nearly so; 2n=40. Native of Europe, now ± established as a weed in waste places from Que. and N.S. to Pa. and N.J., near the coast. July–Sept.
Dry banks of ditches, dry waste ground, railway banks and tracks, sea shores. Disturbed sites, especially open sandy or gravelly places. Coastal and river sands, railroad embankments and near dwellings.
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