natural monocultures

Stenochlaena: Climbing Fern

65 million years ago, a meteor named Chicxulub struck Mesoamerica, wiping out 95 percent of the living things in North America. The first species to propogate the sterile clay was an ancestor of the Malaysian Climbing Fern that now covers entire islands in the South Pacific.

North America was almost entirely covered in climbing fern for tens of thousands of years.