A study was made of a "cambarazal" located in the municipality of Pocone, State of Mato Grosso, km 94 of the Transpantaneira Road. An area of 1.500m² was sampled and divided in three transects of 10 x 50m. All trees with circumference at soil level > 10cm were measured to obtain data on relative density, absolute and relative frequency, relative dominance and importance value. A total of 15 families, 19 genera and 23 species were found. Vochysia divergens was considered to be the most important species followed by Erythroxylum sp. and Aulomyrcia mutabilis. The floristic richness of the "cambarazal" was lower than Amazonian rain forest and Atiantic rain forest but similar to "caatinga" woodland. The supposition that V. divergens is a colonist species of marshes in the Poconé "pantanal" and the phases of the process of occupation and formation of a "cambarazal" were discussed.
"cambarazal"; structure; floristics; "pantanal"; Brazil