Amazon biome Amazonas, Brazil contains campinarana, dense rainforest and contact between campinarana and rainforest. The vegetation formations include terra firme forests and igapós. Submontane forests climb the first steps of the Guiana Plateau to about , followed by montane forests. Lichens and bromeliads are found up to . There is also alpine tundra in the tabular plateaus. The Amazon basin contains several large areas of moist forest, collectively called the Amazon rainforest. These are the Caquetá, Japurá-Solimões-Negro, Juruá-Purus, Madeira-Tapajós, Napo, Purus-Madeira, Solimões-Japurá, Southwest Amazon, Tapajós-Xingu, Tocantins-Pindara, Uatuma-Trombetas, Ucayali and Xingu-Tocantins-Araguaia moist forests. Each has distinctive vegetation. In the broad definition favored by
Amazon rainforest biodiversity of plant species is the highest on Earth with one 2001 study finding a quarter square kilometer (62 acres) of Ecuadorian rainforest supports more than 1,100 tree species. A study in 1999 found one square kilometer (247 acres) of Amazon rainforest can contain about 90,790 tonnes of living plants. The average plant biomass is estimated at 356 ± 47 tonnes per hectare. To date, an estimated 438,000 species of plants of economic and social interest have been registered in the region with many more remaining to be discovered or catalogued. The total number of tree species in the region