milk thistle

noun7

1. •
   Any of the thistles in the genus Silybum, especially Silybum marianum.
2. •
   Various plants of genus Sonchus (sow thistles) with milky sap.
3. •
   Sonchus asper rough milk thistle
4. •
   Sonchus arvensis field milk thistle
5. •
   Sonchus oleraceus (common sow thistle)
6. •
   Sonchus wilmsii
7. •
   Lactuca serriola, prickly lettuce