Compilation
Senecio squalidus

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Name

Identification
Senecio squalidus Druce [family ASTERACEAE ] (stored under name); Senecio rupestris Fiori [family ASTERACEAE ]
Related name
  • Senecio squalidus
  • Senecio glaucus
  • Senecio desfontainei
  • Senecio albanensis
  • Senecio laciniatus
  • Senecio unrecorded
  • Senecio rupestris
  • Senecio coronopifolius
  • Senecio crassifolius
  • Senecio parviflorus
  • Senecio nebrodensis
  • Senecio chrysanthemifolius
  • Senecio aetnensis
  • Jacobaea carnosa
Common name
  • Oxford ragwort, Flora of North America Vol. 20

Flora

Entry for Senecio squalidus Linnaeus [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 20,
Names
Senecio squalidus Linnaeus [family COMPOSITAE], Sp. Pl., 2: 869. 1753
Treatment Author(s)
Theodore M. Barkley†
Information
Annuals (or perennials), 15–60+ cm (taprooted). Herbage sparsely, unevenly floccose to subglabrous, glabrescent. Stems single (branching distally). Leaves evenly distributed; petiolate (proximal, petioles ± winged); blades obovate to oblong, 4–10 × 2–4+ cm, mostly lyrate-pinnatifid to pinnate, bases tapered, ultimate margins dentate (distal leaves similar, smaller, sessile). Heads (3–)6–20 in open, cymiform arrays. Calyculi of 4–10+ bractlets (1–2+ mm). Phyllaries (± 13) ± 21, 5–6+ mm, tips black. Ray florets ± 13; corolla laminae 5–8 mm. Cypselae usually hairy. 2n = 20.
Phenology
dec-feb (winter), mar-may (spring), sep-nov (fall)
Altitude range
0–300 m;
Distribution
Europe.USA Calif.Canada N.S.
Discussion
Senecio squalidus is native in Europe, where it is a common weed. It is apparently established in the San Francisco Bay area, California and has been reported from British Columbia, New Brunswick, and Nova Scotia. It is to be expected elsewhere.
Native/Introduced
introduced;

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