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What is another word for milk thistle?

What's another word for milk thistle? | Here's a list of synonyms for milk thistle.

Definition 1: 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 - [noun denoting plant]

Definition 1: tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America - [noun denoting plant]