The Swedish natural scientist Carl von Linné (1707–78) prepared his notes and pen drawings on botanical systems in Stockholm from 1750 to 1751. Also known by his Latinized name of Carolus Linnaeus, Linné was the creator and founder of botanical and zoological taxonomy. He devised a two-part system of Latin names (the so-called binominal nomenclature) for classifying all organisms based on their characteristics, using the name of the genus followed by the species name. This system, which is still in use today, was developed in his work Systema naturae (System of nature), the first edition of which was published in 1735. Presented here is one of Linné’s botanical notebooks, preserved in the Slovak National Library. It consists mainly of handwritten notes, along with sketches of plants or particular parts thereof. In 1753, Linné published his masterpiece in two volumes and 1,200 pages, Species plantarum (Plant species). In this work, he listed all of the plant species that had been discovered up to that time (nearly 6,000 in all) and classified them into about 1,000 genera. This was the first time that plants had been classified and named using the binomial nomenclature.