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
同义词：sow thistle
tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
同义词：lady's thistle??/??Our Lady's mild thistle??/??holy thistle??/??blessed thistle??/??Silybum marianum
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