"Next it was found that it was physiologically and structurally the same in the plant, that it was the living part of the plant, that which manifested the life and did the work in vegetable as well as in animal organisms."
American botanist regarded as one of the most important U.S. botanists of the 19th century. He was a leading advocate for Darwin's ideas in America and developed major botanical reference works. He died in 1888.