1. (

• ragwort ,
• tansy_ragwort ,
• ragweed ,
• benweed ,
• Senecio_jacobaea

) widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity ;

2. (

• butterweed ,
• ragwort ,
• Senecio_glabellus

) American ragwort with yellow flowers ;