A LibDem leaflet is being circulated around Oxford West and Abingdon which is designed to look and feel like an official Green Party communication.
It urges people to vote tactically for the LibDems to keep out the Tories.
It quotes former Green Parliamentary Candidate Chris Goodall in a manner which voters are led to believe represents an official Green Party position. It does not.
The Green Party have had no involvement in the letter and are standing a strong candidate, Larry Sanders, in the hope of unseating the Tory encumbent.
Says a Green Party spokesperson: "This type of misleading campaigning is the reason why trust in politicians is being eroded. Last time people elected LibDems - they got a Tory-led coalition. People are looking for real change which wont come about through voting LibDem."
The Greens are making an official complaint to the electoral returning officer.