E-Flora BC: Electronic Atlas of the Flora of British Columbia

Jacobaea vulgaris
tansy ragwort
Asteraceae (Aster family)

Introduction to Vascular Plants

© Brian Klinkenberg  Email the photographer   (Photo ID #86762)

E-Flora BC Static Map
Distribution of Jacobaea vulgaris
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Species Information

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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, thinly woolly-hairy when young but usually glabrous by flowering time; stem leaves similar, progressively reduced upwards, becoming unstalked.
Heads with ray and disk flowers, several to numerous in clusters; involucres 2-5 mm tall; involucral bracts oblanceolate, with long-pointed, usually black tips, hairless to sparsely woolly-hairy, margins translucent; bracteoles few, black-tipped; ray flowers yellow, 4-10 mm long; disk flowers yellow.
Achenes oblong, nerved, those of the disk flowers minutely coarse-hairy, those of the ray flowers glabrous; pappus of white hairlike bristles.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry fields, clearcuts and pastures in the lowland zone; locally frequent on S Vancouver Island and adjacent lower mainland; introduced from Eurasia.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Jacobaea vulgaris

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 1370 1370 1370
Slope Gradient (%) 40 40 40
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
220 220 220
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 3 3
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: SWB(1)

Synonyms and Alternate Names

Senecio jacobaea L.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References