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Nodding Thistle or Musk Thistle (Carduus nutans), a biennial thistle native to Eurasia but now a widespread weed in many temperate and subtropical areas of both hemispheres. It can grow to as much as 15m tall, is spiny all-over and the flowerheads are usually nodding, though they can be held horizontal or semi-erect. Order: Asterales, Family: Asteraceae