Carl Linnaeus first classifies the poppy, Papaver somniferum (sleep-inducing) in his Genera Plantarum.

One of his major works, the first edition is published in 1735 during his stay in the Netherlands.

The book is published in Latin, as is customary for the scientific literature of its day.

In it, he outlines his ideas for the hierarchical classification of the natural world, dividing it into the animal kingdom (Regnum animale), the plant kingdom (Regnum vegetabile) and the "mineral kingdom" (Regnum lapideum).