Exemplary life stories, anecdotes, experiments and research by naturalists, botanists, geneticists, philosophers, explorers who have revolutionized our idea of ​​the plant world. The green universe in five centuries of astonishing discoveries: Charles Darwin and the Madagascar orchid that can only be pollinated by one type of butterfly, the crucial theory of the English scientist on cross-fertilization and the evolution of plants, Federico Delpino who studied the collaboration between plants and ants, Leonardo da Vinci's investigation into the arrangement of leaves to capture sunlight, the discovery of Amorphophallus Titanium by Odoardo Beccari in Sumatra, the tragic story of Nikolaj Ivanovic Vavilov who, trying to select in the laboratory the super-grain of wheat capable of feeding millions of Russians, will preserve the biodiversity of plants but dies of starvation in a Soviet prison. And, again, the genius of Marcello Malpighi, the invention of plant genetics by Abbot Mendel, the incredible life of George Washington Carver, the first black American to graduate, and the tenacity with which, at the risk of his own safety, Charles Harrison Blackley identified the origin of hay fever. A book full of curiosity and love for the green universe.