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)

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