Preliminary List of the Cyperaceae in Northeastern Brazil is the third title to be published in the series Repatriation of Kew Herbarium Data for the Flora of Northeastern Brazil. Between 2002 and 2004, 1392 Cyperaceae specimens were examined and the information epatriated. This checklist records 191 species in 24 genera, with entries listed alphabetically and sorted by state, collector and number. The database that underpins this checklist is available on the internet at: http://www.kew.org/scihort/tropamerica/repatriation. htm, along with images of NE Brazilian type specimens held at Kew. In English and Portuguese.