The mean annual relative humidity is c. There are three strata. The canopy towers c. 31 m above the forest floor, with emergents reaching 40 m. The density of these trees is c. 1358 individuals per ha, and c. 15 trees per ha are 80 cm or more in dbh.
Many species have latex or buttressed roots.
The trees are usually smaller, less densely distributed, with lighter coloured trunks and stiffer leaves. This forest is less rich in species, but has a surprising number of endemics, both woody and herbaceous. 8 m above the forest floor, and is the poorest in species of all four vegetation types. Tabebuia cassinoides is clearly dominant, together with Cecropia lyratiloba and Bactris setosa . In the dense graminoid herbaceous layer, Acrostichum danaefolium and Blechnum serrulatum occur.