Summary ²

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) Rancho del Oso - Big Basin Redwoods State Park, all rights reserved, uploaded by Rancho del Oso - Big Basin Redwoods State Park
2. (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Erigeron_canadensis

More Info

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