The book that had an enormous accelerating effect on the science of plant systematics was "Species Plantarum" (1753) by Linnaeus. It presented a complete list of the plant species then known to Europe, ordered for the purpose of easy identification using the number and arrangement of the male and female sexual organs of the plants. Of the groups in this book, the highest rank that continues to be used today is the genus. The consistent use of binomial nomenclature along with a complete listing of all plants provided a huge stimulus for the field.