A HOLYROOD debate to mark the Queen's Diamond Jubilee is set to highlight differences over the monarchy in the campaign for independence.

The Scottish Greens are part of the Yes Scotland movement, which has no agreed position on the monarchy.

They have refused to sign the motion for Wednesday's event because they want Scotland to be a republic with an elected head of state.

Green MSP Patrick Harvie hopes to use the debate to spell out his opposition to the monarchy.

The Green position is in sharp contrast to the SNP's plan to keep the Queen as head of state if Scots vote for independence in 2014.

The First Minister, a past visitor to Balmoral, is a keen supporter of the Queen.

The motion welcomes the jubilee, congratulates the Queen, and praise her personally.

Harvie told the Sunday Herald: "It's really endorsing the monarchy, which is contrary to our party policy. It would not have sat well with our party policy for removing the hereditary principle from the constitution."

Last week the Sunday Herald revealed the Scottish Socialist Party (SSP), another member of Yes Scotland, was also in open conflict with the SNP's stance as it also wants a republic.

If there is a second referendum question in 2014, the SSP also want that to be on the monarchy, not whether Holyrood should have more powers.

A Scottish Labour spokesman said: "Another day, another split amongst the Nationalist campaign."