This indicator measures the proportion of ecosystem diversity that is still existing or likely to persist based on a classification of known and undiscovered taxonomic groupings of species. The results presented here are for vascular plants. Future variants of this indicator will include results for other taxonomic groups. The persistence of ecosystems indicator 2.2c, reported here, is one of a series of indicators on the status of biodiversity and ecological integrity in NSW developed to contribute to assessing the performance of the Biodiversity Conservation Act 2016. The overarching indicator framework which outlines how indicators are related and derived is presented in the “method to assess biodiversity and ecological integrity across New South Wales” (OEH 2018a).