Carl Linnaeus (1707-1778) The twenty-four classes of the classification system based on the characters of the reproductive organs contained in the flowers (hence the name of "sexual system"); characters that Linnaeus considered more stable and therefore useful for the recognition of plants; and in relation to which effected a profound rearrangement of the systematic; with the introduction of many new names of genera and species; leading to a revolution nomenclatural he met various opponents. Leiden; 1737.