1. blue thistle a coarse prickly European weed with spikes of blue flowers
  2. bull thistle European thistle with rather large heads and prickly leaves
  3. plume thistle any of numerous biennial to perennial herbs with handsome purple or yellow or occasionally white flower heads
  4. boar thistle European thistle with rather large heads and prickly leaves
  5. plumed thistle any of numerous biennial to perennial herbs with handsome purple or yellow or occasionally white flower heads
  6. boat whistle a whistle on a boat that is sounded as a warning
  7. holy thistle tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
  8. woolly thistle biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America
  9. blessed thistle tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
  10. globe thistle any of various plants of the genus Echinops having prickly leaves and dense globose heads of bluish flowers
  11. brook thistle of central and southwestern Europe
  12. Paul the Apostle a Christian missionary to the Gentiles
  13. milk thistle 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
  14. white thistle any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America
  15. field thistle stout North American thistle with purplish-pink flower heads
  16. spear thistle European thistle with rather large heads and prickly leaves
  17. sow thistle 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
  18. golden thistle any of several spiny Mediterranean herbs of the genus Scolymus having yellow flower heads
  19. welted thistle European biennial introduced in North America having flower heads in crowded clusters at ends of branches
  20. bluebottle an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers

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