1. Tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
   - milk thistle, lady's thistle, Our Lady's mild thistle, holy thistle, blessed thistle

Type of: herb, herbaceous plant

Part of: genus Silybum, Silybum

Encyclopedia: Silybum marianum

• genus Tunga
• genus Tupaia
• genus Tupinambis
• genus Turbatrix
• genus Turdus
• genus Turnix
• genus Turreae
• genus Turritis
• genus Tursiops
• genus Tussilago
• genus Tylenchus
• genus Tympanuchus
• genus Typha
• genus Tyrannosaurus
• genus Tyrannus
• genus Tyto
• genus Uca
• genus Uintatherium
• genus Ulex
• genus Ulmus
• genus Ulva
• genus Uma
• genus Umbellularia
• genus Umbrina
• genus Unio