Lowland evergreen forest geocomplex. 1. Evergreen peneplain forests: Goupia glabra-Clathrotropis macrocarpa and Swartzia schomburgkii-Clathrotropis macrocarpa communities. Ondulated lateritic Amazonian dissect peneplains on tertiary materials (Miocene). 2. Flooded riparian forest & woodland: Didymocistus chrysadenius-Euterpe precatoria and Caryocar microcarpum-Macrolobium acaciefolium communities. Clear water stream flood plain and old meander riverbanks (lotic). 3. Riparian woodland: Byrsonima japurensis-Inga punctata community. Riverine successional clear water stream-banks (lotic). 4. Flooded riparian forest & woodland: Acosmium nitens-Amanoa oblongifolia community. Black water flood plain streams (lotic). 5. Evergreen seasonal sclerophyllous woodland (“Amazonian Caatinga”): Mauritia carana-Rhodognaphalopsis brevipes community. Seasonally ponded flat depressions paleochannels with sandy quartz sediments and poorly drained podsolized-oligotrophic soils. 6. Tabebuia insignis-Mauritia flexuosa community. Dystrophic black-water permanently flooded swamps. 7. Scleromorphic scrub: Dimorphandra cuprea-Ilex divaricata community. Top of sandstone plateaus (Paleozoic Aracuara Formation) with well-drained shallow soils 300-350 m. 8. Macairea rufescens-Bonnetia martiana community. Scleromorphic low forest on top of sandstone plateaus (slightly concave areas) with somewhat deep sandy soils semipermanently saturated. 9. Axonopus schultesii-Schoenocephalium martianum community. Graminoid herbaceous savanna on shallow very acid white-sand saturated soils. 10. Saxicolous low terophytic open epilithic vegetation: Xyris wurdackii-Paspalum tillettii and Siphanthera hotsmannii-Xyris paraensis communities. Exposed hard rock with very thin lithic leptosols. 11. Saxicolous-fissuricole vegetation: Navia garcia-barrigae communities. Paleozoic sandstone rocky outcrops. Graphic geobotanical interpretation based on Duivenboorden and Lips (1995) and Google Earth images.