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Definitions:
Noun
sow thistle
milk thistle
Definition: 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
milk thistle
lady's thistle
Our Lady's mild thistle
holy thistle
blessed thistle
Silybum marianum
Definition: tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
Definition: Any of the thistles in the genus Silybum, especially Silybum marianum.