Hugo de Vries (Haarlem, 1848 – Lunteren, 1935), a botanist at the University of Amsterdam, publishes in March 1900 "Das Spaltungsgesetz der Bastarde" in the Berichte der Deutschen Botanischen Gesellschaft, independently rediscovering Mendel's laws of segregation after years of hybridization experiments with about thirty plant species. While reviewing prior literature he found Mendel's 1866 article and cited it as a precursor. De Vries published first of the three simultaneous rediscoverers, and added the concept of mutation (1901) as a source of new hereditary variation, complementing the Mendelian mechanism of transmission.