GrassWorld is an online information system of the world’s grasses derived from a DELTA dataset. The current version has descriptions to most species in English, French, German and Spanish. The basic kernel of GrassWorld is the morphological data of Kew’s Grassbase to which many ancillary characters have been added - bibliographic, geographic, illustration sources, name derivation, cytology, classification, naturalised status. There are plans to produce generic descriptions using DELTA gesumm. Users are encouraged to notify us of missing or wrong information. Links to Interactive keys via IdentifyLife will be placed on the website once this facility has been set up on the latter website.