Summary ⁵

Erigeron canadensis (synonym Conyza canadensis) is an annual plant native throughout most of North America and Central America. It is also widely naturalized in Eurasia and Australia. Common names include horseweed, Canadian horseweed, Canadian fleabane, coltstail, marestail and butterweed. It was the first weed to have developed glyphosate resistance, reported in 2001 from Delaware.

Sources and Credits

1. (c) Matthew Herron, some rights reserved (CC BY-NC), uploaded by Matthew Herron
2. (c) Sarah Gregg, some rights reserved (CC BY-NC-SA), https://www.flickr.com/photos/wild-eyes/10166008264/
3. (c) Melissa McMasters, some rights reserved (CC BY), https://www.flickr.com/photos/cricketsblog/19969059462/
4. (c) Anthony Mendoza, some rights reserved (CC BY-NC-SA), https://www.flickr.com/photos/39039456@N07/4032180344/
5. (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Erigeron_canadensis

More Info

• iNat 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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