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milk thistle, sow thistle | any of several Old World coarse prickly-leaved shrubs and subshrubs having milky juice and yellow flowers; widely naturalized; often noxious weeds in cultivated soil | |
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blessed thistle, milk thistle, lady's thistle, Our Lady's mild thistle, holy thistle, Silybum marianum | tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America |