Green Party Leader Elizabeth May is nixing any suggestion her party would join in any future merger with the Liberals and the NDP.

May told CTV's Power Play on Monday that her party is too different to fit with the two other opposition parties.

She also said she "doesn't see" a merger ever working between the Liberals and the NDP.

The Green leader joked the only people she is interested in merging with are "the 40 per cent of Canadians who don't vote."

Speculation of a merger between Canada's left-leaning parties began soon after the Liberals lost 43 seats in the May election and lost their status as the Official Opposition, then surfaced again after the death of NDP Leader Jack Layton.

As for May's party, she formed a pact with then-Liberal leader Stéphane Dion in 2007, when he broke with political tradition and vowed to help elect May by not running a Liberal candidate in the Nova Scotia riding which she contested.

The Greens in turn agreed not to run a candidate to oppose Dion in his Montreal riding. At the time, the two leaders said they were putting their shared concern about the environment ahead of politics.

May made history last spring when she became the first Green Party candidate elected to the House of Commons. She represents the British Columbia riding of Saanich-Gulf Islands.

In the current session of Parliament, May says her main focus will be the economy.

Although she is only one voice in the Commons, she vowed to present amendments to all the Conservative government's bills and to mount a fight against the continued drop in the corporate tax rate.

Canada already has one of the lowest corporate tax rates in the developed world, she said.

She has previously argued that it makes no sense for the corporate tax rate to continue to fall, even through recessionary times. The Greens have proposed the corporate tax rate return to its 2008 level of 19.5 per cent. By next year, that rate is to fall to 15 per cent.

In 2000, the general rate of taxation on corporate profits was 29.1 per cent.