NOTWITHSTANDING the relative uniformity of their environment, aquatic plants ... thus restricted, many plants are dealt with which are familiar to botanists outside America.

The source of their toxicity is unknown, but scientists assume that it may be from plant poisons ... million litres of water flows over the Iguazu falls every second South America is also home ...

South America ... with its mouth taking water into the Atlantic Ocean. Piranhas have adapted to live in the Amazon River. Their teeth are designed to tear through plants and animals.

No one's sure how the South American water hyacinth invaded Africa's Lake Victoria but there's little doubt as to the damages it has caused. In 1989, the weed was spotted in the lake and seven ...

Native to South America, water hyacinth forms dense mats that can double in size in 6-18 days, according to the University of ...