Linnaeus and the first system of classification of plants
Carl Linnaeus attended Uppsala University as a medical student, but he became very interested in the forms and diversity of plant reproductive organs. He noticed that different species of flowers had different ratios of male (stamen) and female (pistil) sexual parts.
After 5 years of research, he published the first book of systematic plant classification, the "Systema Naturae" (in 1735). This was such a significant publication since it was the first to establish relationships and a basis for naming plants according to their physical characteristics.