but·ter·weed /ˈbʌtɚ/
But·ter·weed n. Bot. An annual composite plant of the Mississippi valley (Senecio lobatus).
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butterweed
n 1: American ragwort with yellow flowers [syn: ragwort, Senecio
glabellus]
2: any of several yellow-flowered plants of the genus Packer;
often placed in genus Senecio