blessed thistle, n.
annual of Mediterranean to Portugal having hairy stems and minutely spiny-toothed leaves and large heads of yellow flowers
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Cnicus benedictus blessed thistle sweet sultan
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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Our Lady's mild thistle Silybum marianum blessed thistle holy thistle lady's thistle milk thistle