- Canadian thistle
- Cirsium incanum, C. setosum, Carduus arvensis, Breea arvensis, B. incana, Serratula arvensis
- Leaf lobes are tipped with needle-like thorns.
- Can be confused with other thistle species.
- The places where it is found on Nantucket are not pristine, but having been disturbed in the past, are now natural.
Growth Form: Herb
Origin: Europe, Asia
Level of Invasiveness for Nantucket: Invasive
Level of Invasiveness for Massachusetts: Not evaluated
Massachusetts Cultivation Restrictions: no