Brazilian environmentalist and former presidential candidate Marina Silva says she's leaving the Green Party.
Silva won a surprising 20 percent of the vote in the first round of last year's presidential election in Brazil. Her candidacy rallied interest in the nation's Green Party.
But she's had differences with party leaders over the direction of the party, and says it has lost the "political vision" she would like it to have.
In 2009, Silva left the governing Workers Party, which she had helped found three decades earlier. She bolted after being ousted as environmental minister.
It is widely expected Silva will run for the presidency in 2014. But her announcement Thursday gives no hint of her political plans.