This digital resource serves as the definitive nomenclatural index for seed-bearing plants, aiming to provide a standardized reference for botanical nomenclature. Developed by the Royal Botanic Gardens, Kew, and published by Oxford University Press, this database aggregates centuries of taxonomic data. It functions as a primary tool for researchers to verify plant names, synonyms, and original publication citations within the field of systematic botany.

Botanists and taxonomists regard this index as a foundational reference for verifying plant nomenclature in academic and research settings. Users often note that while the software interface is dated, the underlying data remains a critical standard for botanical documentation.