The vegetation of Curitiba is also characterized by the existence of a large quantity of purple and yellow ipÃ s ( tabebuias ) , making a spectacle of beauty to the landscape of the city during the flowering in the end of winter . The vegetation of Curitiba is also characterized by the existence of a large quantity of purple and yellow ipÃ s ( tabebuias ) , making a beautiful sight during the flowering at the end of winter .