New Democrat MP Jean-Francois Larose has joined forces with an independent MP to create a new, Quebec-only party.

Larose is the fourth Quebec MP to abandon the NDP since its fabled orange wave swept 59 of the province's 75 seats in the 2011 election.

The party's Quebec caucus chair, Robert Aubin, says Larose is betraying the memory of Jack Layton, who died a few months after leading the NDP to its best electoral showing ever.

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Larose is joining Jean-Francois Fortin, a former Bloc Quebecois MP, to form Forces et Democratie, a party they say will be dedicated to defending the interests of Quebec's regions.

Fortin quit the Bloc last summer, after hard core sovereigntist Mario Beaulieu was chosen as the new leader.

NDP insiders say Larose quit because he was unlikely to win the nomination in his riding of Repentigny.