Prickly Sowthistle

Sonchus asper

Summary 5

Sonchus asper, the prickly sow-thistle, rough milk thistle, spiny sowthistle, sharp-fringed sow thistle, or spiny-leaved sow thistle, is a widespread plant in the dandelion tribe within the daisy family.

How to recognize it? 6

Yellow flowers (dandelion-like), abundant at the ends of stems. Sticky bracts. Prickles on edge of leaf. Milky sap.

Observations in Banff National Park 7

Sources and Credits

  1. Helge Klaus Rieder, no known copyright restrictions (public domain),
  2. (c) lupe, some rights reserved (CC BY-NC), uploaded by lupe
  3. (c) Matt Lavin, some rights reserved (CC BY-SA),
  4. (c) bioblitzbanff, all rights reserved
  5. Adapted by bioblitzbanff from a work by (c) Wikipedia, some rights reserved (CC BY-SA),
  6. (c) bioblitzbanff, some rights reserved (CC BY-SA)
  7. (c) metallyza, some rights reserved (CC BY-SA)

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