Field Guide to Noxious and Other Selected Weeds of British Columbia
Tansy Ragwort
(Senecio jacobaea)
Provincial Noxious Weed
biennial to short-lived perennial growing 0.3 to 1.2 metres
tall; leaves deeply cut into irregular segments give plant a
"ragged" appearance; yellow flowers in a flat-topped
cluster
contains a toxic alkaloid which reacts with enzyme in livestock
to create cumulative liver damage
Deeply divided rosette leaves
Ray flowers distinguish this plant from common tansy (Tanacetum
vulgare)