Our Lady's mild thistle

Thesaurus

Noun

1.Our Lady's mild thistle - tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South Americablessed thistle, holy thistle, lady's thistle, Silybum marianum, milk thistlegenus Silybum, Silybum - small genus of east African herbsherb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests