June 30, 1817 (a Monday)

Joseph Hooker (seated, far left) and on the ground next to him, Asa Gray – 2 of the first 3 men to whom Darwin revealed his theory of evolution by natural selection (July, 1877 U.S. Geological Survey at La Veta Pass, CO)

On this date, the physician, botanist, and biogeographer Joseph Dalton Hooker was born in Halesworth in the county of Suffolk, England. He trained as a doctor in Edinburgh, but his principal interest was in botany.

Joseph Hooker (1896)

Hooker was a close friend and supporter of Charles Darwin. When he realized that Alfred Russel Wallace was about to present his findings on evolution to the public which were similar to Darwin’s, he helped arrange for the shared presentation of Darwin ‘s and Wallace’s papers to the Linnaean Society of London in 1858.

Hooker came to America in 1877 to explore the flora of the Rocky Mountains of Colorado and the Sierra Nevada Mountains of California. He traveled to Pueblo, Colorado with a group of colleagues including Asa Gray. Later, Hooker traveled to La Veta Pass, CO and camped with a group of naturalists and explorers. The group later traveled to the Sangre de Cristo range where Hooker and Gray conducted a plant survey and wrote a manuscript about their experience, The Vegetation of the Rocky Mountain Region and a comparison with that of other parts of the World (1880).

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