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

https://inaturalist.ca/observations?project_id=69401&taxon_id=53269&place_id=any&verifiable=any

Sources and Credits

1. Helge Klaus Rieder, no known copyright restrictions (public domain), http://commons.wikimedia.org/wiki/File:Gem%C3%BCse_Gaensedistel_Roscheiderhof_H4.jpg
2. (c) lupe, some rights reserved (CC BY-NC), uploaded by lupe
3. (c) Matt Lavin, some rights reserved (CC BY-SA), http://commons.wikimedia.org/wiki/File:Sonchus_asper_(4971086051).jpg
4. (c) bioblitzbanff, all rights reserved
5. Adapted by bioblitzbanff from a work by (c) Wikipedia, some rights reserved (CC BY-SA), https://en.wikipedia.org/wiki/Sonchus_asper
6. (c) bioblitzbanff, some rights reserved (CC BY-SA)
7. (c) metallyza, some rights reserved (CC BY-SA)

More Info

• iNaturalist.ca taxon page
• African Plants - a photo guide
• Atlas of Living Australia
• Biodiversity Heritage Library
• BOLD Systems BIN search
• Calflora
• CalPhotos
• Catalogo de Plantas y Líquenes de Colombia
• eFloras.org
• Flora Digital de Portugal
• Flora of North America (beta)
• Global Biodiversity Information Facility (GBIF)
• Go Botany
• HOSTS - a Database of the World's Lepidopteran Hostplants
• IPNI (with links to POWO, WFO, and BHL)
• Jepson eFlora
• Maryland Biodiversity Project
• NatureServe Explorer 2.0
• NBN Atlas
• New Zealand Plant Conservation Network
• OregonFlora.org
• SEINet Symbiota portals
• Tropicos
• USDA PLANTS database
• VASCAN by Canadensys
• World Flora Online
• 日本のレッドデータ検索システム
• 植物和名−学名インデックス YList

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