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[rag-wurt, -wawrt] /ˈrægˌwɜrt, -ˌwɔrt/
any of various composite plants of the genus Senecio, as S. jacobaea, of the Old World, having yellow flowers and irregularly lobed leaves, or S. aureus (golden ragwort) of North America, also having yellow flowers.
1325-75; Middle English; see rag1, wort2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for ragwort
  • Common tansy is a widespread noxious weed that often grows with tansy ragwort.
  • Many species of groundsel or ragwort are commonly found on the prairie.
British Dictionary definitions for ragwort


any of several plants of the genus Senecio, esp S. jacobaea of Europe, that have yellow daisy-like flowers: family Asteraceae (composites) See also groundsel (sense 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for ragwort

mid-15c., from ragged, in reference to the appearance of the leaves, + wort.

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for ragwort


any of about 1,200 species of annual, biennial, and perennial herbs, shrubs, trees, and climbers constituting the genus Senecio of the family Asteraceae, distributed throughout the world. Some species are cultivated as border plants or houseplants, and many species contain alkaloids that are poisonous to grazing animals

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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