Page author: Don Knoke
Senecio vulgaris
common groundsel, old man in the spring
WTU specimens
Other herbaria

Distribution: Introduced throughout the United States; common west of the Cascades in the Pacific Northwest

Habitat: Roadsides, waste ground

Origin: Introduced from Europe

Conservation Status: Not of concern

Description:
General:

Simple or strongly-branched, tap-rooted annual, 1-4 dm. tall.

Leaves:

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.

Flowers:

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.

Identification Notes:

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. vulgarisÆ are black-tipped) and the aroma (only S. sylvaticus is malodorous).

Accepted Name:
Senecio vulgaris L.
Publication: Sp. Pl. 2: 867. 1753. 1753.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Senecio vulgaris in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Senecio vulgaris checklist entry.

E-Flora BC: Senecio vulgaris atlas page.

CalPhotos: Senecio vulgaris photos.

USDA Plants: Senecio vulgaris information.

21 photographs:
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