This work serves as the definitive nomenclatural index for seed-bearing plants, aiming to provide a standardized reference for botanical names and their original publication citations. Compiled by the staff at the Royal Botanic Gardens, Kew, the index provides a systematic record of plant names to resolve taxonomic confusion. It functions as a foundational bibliographic tool for botanists, researchers, and taxonomists seeking to verify the validity and history of plant nomenclature.

Botanists and researchers recognize this index as a primary authority for plant nomenclature and taxonomic verification. The text is highly technical and dense, serving as a specialized reference work rather than a narrative or instructional guide.