Carduus thoermeri (weed)

Carduus • Asteraceae (weeds) • Asterales (weeds) • Eudicotyledons • all weeds • pests-diseases-weeds

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Carduus thoermeri (click on image to enlarge it)
Author(s): C.T. Johansson
Source: Wikimedia Commons

Carduus thoermeri (weed) Weinmann

This thistle is of Eurasian origin and was introduced into North America.

Taxonomic note:
C. thoermeri Weinm. is regarded by some authors as a synonym of Carduus nutans L. subsp. leiophyllus (Petrovič) Stoj. & Stef.