Species: 

Rhaponticum repens (=Acroptilon repens )

Common Name: 

Russian knapweed

Systems Affected (standardized): 

rangeland, riparian/aquatic, forest/woodland, cropland/pastureland, disturbed/waste areas

Regions(s) present (updated by AB): 

ALL

5563325-PPT.jpg
Impacts: 

Crowds out native species and desirable forage; toxic to horses, can cause chewing disease in horses; Crowds out native species and desirable forage; toxic to horses. can cause chewing disease in horses. Negatively impacts agriculture
Negatively impacts animal health
Negatively impacts tourism
Reduced amenity values
Reduced native biodiversity

Source? likely to be reintroduced: 

R. repens was introduced to Canada as a contaminant of Turkestan lucerne seed in the early 1900s; it arrived in California, USA in about 1910 as a contaminant of Turkestan lucerne seed or possibly sugarbeet seed. Contaminated crop seeds are likely to be responsible for its spread worldwide. The risk of introduction is high if lucerne and other crop seeds are not screened for the presence of R. repens seeds; Accidental introductions of R. repens have occurred in contaminated grain seed and are likely to be responsible for the spread of this species around the world.The risk of introduction is high if lucerne and other crop seeds are not screened for the presence of R. repens seeds

Info Blurb: 

Crowds out native species and desirable forage. Toxic to horses. Introduced as a seed contaminant.

Native Regions in OK: 

NONE

Current and past designations: 

BS, KS, NM; WFHC

Present in OK?

Yes

Present in Bordering States?

TX, NM, CO, KS, MO

Has Legal Status in BS?

CO List B, KS NW, NM Class B