A list of Poaceae collected in periodically flooded and permanently flooded areas in the paraense northeastern region of Pará State is presented. Currently, 31 genera and 83 species are recognized. The most representative groups are Paspalum, Panicum (17 and 18 taxa, respectively), and the tribe Paniceae (57 taxa). The systematic position, taxonomic affinities, geographical distribution, vegetative cicle, a list of examined specimens, and illustrations of spikelet of each species are given.
Poaceae; Amazônia; wetlands
