Tansy Ragwort

Senecio jacobaea

Range: Locally frequent on S Vancouver Island and adjacent lower mainland; introduced from Eurasia.

Description: Biennial or short-lived perennial herb from a poorly-developed to evident taproot; stems erect, solitary or several, branched above, sparsely to densely white woolly-hairy, 0.2-1 m tall.  Basal leaves oblanceolate, stalked, 4-20 cm long including the stalk, 2-6 cm wide, mostly 2-3 times pinnately cut.  Heads with ray and disk flowers, several to numerous in clustersRay flowers yellow, 4-10 mm long; disk flowers yellow.

Ecology: Mesic to dry fields, clearcuts and pastures in the lowland zone.

Notes: Invasive species

  • Eflora
  • Pojar, J. and A. MacKinnon.  1994.  Plants of Coastal British Columbia: including Washington, Oregon & Alaska. Lone Pine Publishing. Vancouver. 528 p.

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