Primary vegetation
Flora of a certain region with low to no human interference.
Primary vegetation refers to all vegetation that evolved under different climatic, soil and water supply conditions and that suffered little or no human interference, such as criminal or licensed suppression or degradation of native flora. In other words, its historical characteristics, such as the variety and number of animal and plant species, have been practically unaffected up to the present day.
Synonyms:
original vegetation, original flora
See also:
https://www.ibama.gov.br/component/legislacao/?view=legislacao&legislacao=115398
http://www.fundacaofia.com.br/gdusm/florestas_estagios.htm
http://www.planalto.gov.br/ccivil_03/_ato2004-2006/2006/lei/l11428.htm