Species: 

Cirsium arvense

Common Name: 

Canada thistle

Systems Affected (standardized): 

cropland/pastureland, rangeland

Regions(s) present (updated by AB): 

PH

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Impacts: 

Crowds out native species; reduces crop and forage yields

Source? likely to be reintroduced: 

C. arvense has the potential to spread to new areas via contaminated crop seed, irrigation channels, or living organisms. There is very little chance that C. arvense will be spread deliberately as it is widely regarded as a pest in most temperate regions and has no value as an ornamental plant

Info Blurb: 

Crowds out native species. Reduces crop and forage yields. Has the potential to spread to new areas via contaminated seed, irrigation channels, or living organisms.

Native Regions in OK: 

NONE

Current and past designations: 

OWL, WFHC

Present in OK?

Yes

Present in Bordering States?

TX, NM, CO, KS, MO

Has Legal Status in BS?

AR NW, CO List B, KS NW, NM Class A, MO NW