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The vascular flora of Britain and Ireland is among the most extensively studied in the world, but the current knowledge base is fragmentary, with taxonomic, ecological and genetic information scattered across different resources. Here we present the first comprehensive data repository of native and alien species optimized for fast and easy online access for ecological, evolutionary and conservation analyses. The inventory is based on the most recent reference flora of Britain and Ireland, with taxon names linked to unique Kew taxon identifiers and DNA barcode data. Our data resource for 3,227 species and 26 traits includes existing and unpublished genome sizes, chromosome numbers and life strategy and life-form assessments, along with existing data on functional traits, species distribution metrics, hybrid propensity, associated biomes, realized niche description, native status and geographic origin of alien species. This resource will facilitate both fundamental and applied research and enhance our understanding of the flora's composition and temporal changes to inform conservation efforts in the face of ongoing climate change and biodiversity loss. Measurement(s) Plant Taxonomy • Native status • Functional traits • Ellenberg indicator values • Life strategy • Associated biome • Origin of non-native species • Species distribution • Hybrid propensity • DNA barcodes • Genome size • Chromosome number Technology Type(s) digital curation • flow cytometry • Chromosome counts Sample Characteristic - Organism Tracheophyta Sample Characteristic - Environment archipelago Sample Characteristic - Location Great Britain • Ireland Machine-accessible metadata file describing the reported data: https://doi.org/10.6084/m9.figshare.16451142 [ABSTRACT FROM AUTHOR]