Summary ²

Cirsium undulatum is a species of thistle known by the common names wavyleaf thistle and gray thistle. It is native to much of central and western North America from Canada to Mexico, and present outside of its native range as an introduced species. It is widespread and found in many habitat types. It is a perennial herb exceeding two meters in maximum height. The stem branches a few times toward the top of the plant if...

Sources and Credits

1. (c) Matt Lavin, some rights reserved (CC BY-SA), https://www.flickr.com/photos/plant_diversity/14677973959/
2. (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Cirsium_undulatum

More Info

• iNaturalist.ca taxon page
• Biodiversity Heritage Library
• BOLD Systems BIN search
• Calflora
• CalPhotos
• eFloras.org
• Flora of North America (beta)
• Global Biodiversity Information Facility (GBIF)
• HOSTS - a Database of the World's Lepidopteran Hostplants
• IPNI (with links to POWO, WFO, and BHL)
• Jepson eFlora
• NatureServe Explorer 2.0
• OregonFlora.org
• SEINet Symbiota portals
• Tropicos
• USDA PLANTS database
• VASCAN by Canadensys
• World Flora Online

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