tansy ragwort
noun
: an Old World yellow-flowered senecio (Senecio jacobaea) that is naturalized in North America and is toxic to livestock
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“Tansy ragwort.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tansy%20ragwort. Accessed 22 Nov. 2024.
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