| 1. milk thistle [ Synonyms: sow thistle] | |
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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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| 2. milk thistle [ Synonyms: blessed thistle, holy thistle, lady's thistle, our lady's mild thistle, silybum marianum] | |
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Tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
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