Heinrich Ludwig Hermann Müller (1829–1883), German botanist who provided important evidence for Darwin's theory of evolution. He was the author in 1873 of Die Befruchtung der Blumen durch Insekten, a book translated at the suggestion of Darwin in 1883 as The fertilisation of flowers. He and Darwin corresponded—36 letters between the two, or from Darwin concerning Müller, are recorded[1]. Darwin cited him extensively in The Descent of Man for his information relating to the behavior of bees.