Roadside flowers

We're in the middle of our dry season and it's that time of the year when we see these very colorful flowers along the Santarém-Cuiabá Highway. They are called Flor-de-São-João, which translates into Saint John's flower. The scientific name of the plant is Pyrostegia venusta. The family is Bignoniaceae. It's a vine and it's native of Brazil. I'm not sure why the association with Saint John, except that the all-saints festivities in June are always very animated events with lots of square dancing, regional foods and participants dressed in colorful hillbilly clothes.