Canada's Plant Hardiness Site

Asteraceae daisy family
Cirsium undulatum (Nutt.) Spreng.
En: wavyleaf thistle, grey thistle;
Fr: chardon des prairies

• [=Carduus undulatus Nutt. – basionym]
• [=Carduus undulatus Nutt. var. megacephalum (A.Gray) Porter]
• [=Cirsium megacephalum (A.Gray) Cockerell]
• [=Cirsium undulatum (Nutt.) Spreng. var. megacephalum (A.Gray) Fernald]
• [=Cnicus undulatus (Nutt.) A.Gray var. megacephalus A.Gray]