He laid the foundations of modern biological systematics and nomenclature in his Species Plantarum (1753).[8] He adopted and popularized a binomial (or binary) system of designation (Morton, 1981)[1] using one name as the genus and a second name as the species name both in Latin or Latinised. This specific name he referred to as a trivial name nomen triviale consisting of a single word, normally a Latin adjective, but any single word would suffice, to identify a particular species, but not intended to describe it. He developed a coherent system for naming organisms and divided the plant kingdom into 25 classes (according to Smith p. 1 and p. 24 according to Dixon, 1973) (Smith, 1955 p. 1),[5][9] one of which, the Cryptogamia, included all plants with concealed reproductive organs.