Senecio viscosus

Linnaeus

Sp. Pl. 2: 868. 1753.

Introduced
Treatment appears in FNA Volume 20. Treatment on page 562. Mentioned on page 546, 548.

Annuals, (10–)20–40(–60) cm (taprooted). Herbage densely fetid-viscid (hairs glandular). Stems single. Leaves evenly distributed; petiolate; blades obovate to oblong (pinnately dissected to pinnatifid), 2–7 × 1.5–4 cm, bases tapered or ± truncate, ultimate margins wavy or crenate-dentate (distal leaves sessile, smaller, ± clasping). Heads (1–)3–8(–30) in irregular, corymbiform arrays. Calyculi of 2–5 bractlets (largest to 4 mm). Phyllaries (± 13) ± 21, 5–7 mm, tips black. Ray florets ± 13; corolla laminae 1–2 mm (usually coiled, scarcely surpassing phyllaries). Cypselae usually glabrous, sometimes hairy. 2n = 40.


Phenology: Flowering spring–fall.
Habitat: Disturbed sites, especially open sandy or gravelly places
Elevation: 1–300 m

Distribution

V20-1252-distribution-map.gif

Introduced; St. Pierre and Miquelon, Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Sask., Conn., Ill., Maine, Mass., Minn., N.H., N.J., N.Y., Pa., R.I., Wis., Eurasia.

Discussion

Senecio viscosus is a smelly, Eurasian weed now widely scattered in areas of cool damp climates, often as a casual waif. The viscid hairs trap wind-blown particles of sand, dust, and soot, which give the surfaces varying textures and colors.

Selected References

None.

Lower Taxa

None.
... more about "Senecio viscosus"
Theodore M. Barkley† +
Linnaeus +
St. Pierre and Miquelon +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Conn. +, Ill. +, Maine +, Mass. +, Minn. +, N.H. +, N.J. +, N.Y. +, Pa. +, R.I. +, Wis. +  and Eurasia. +
1–300 m +
Disturbed sites, especially open sandy or gravelly places +
Flowering spring–fall. +
Introduced +
Compositae +
Senecio viscosus +
species +