Summary ³

Sonchus arvensis, the field milk thistle, field sowthistle, perennial sow-thistle, corn sow thistle, dindle, gutweed, swine thistle, or tree sow thistle, is a species of flowering plant in the daisy family Asteraceae. S. arvensis often occurs in annual crops in the northern parts of Europe and may cause substantial yield losses.

How to recognize it? ⁴

Yellow flowers (dandelion-like), abundant at the ends of stems. Sticky bracts. Prickles on edge of leaf. Milky sap. Lower leaves are deeply lobed with prickly edges. Grow to 2m (6.6 ft).

Native lookalike: Yellow False Dandelion

Sources and Credits

1. (c) Kathy Ward, some rights reserved (CC BY-NC), uploaded by Kathy Ward
2. Carl Axel Magnus Lindman , no known copyright restrictions (public domain), http://commons.wikimedia.org/wiki/File:554_Sonchus_arvensis.jpg
3. Adapted by bioblitzbanff from a work by (c) Wikipedia, some rights reserved (CC BY-SA), https://en.wikipedia.org/wiki/Sonchus_arvensis
4. Adapted by metallyza from a work by (c) bioblitzbanff, some rights reserved (CC BY-SA)

More Info

• iNaturalist.ca taxon page
• African Plants - a photo guide
• Biodiversity Heritage Library
• BOLD Systems BIN search
• Calflora
• CalPhotos
• eFloras.org
• 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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