Plant of the genus Senecio with yellow daisy-like flowers (7)

I believe the answer is:

ragwort

(Other definitions for ragwort that I've seen before include "13 across toxic to livestock" , "Plant toxic to livestock" , "Widespread obnoxious weed" , "Yellow-flowered weed" , "I'm toxic to livestock" .)

I've seen this clue in The Independent.

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