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Connected to Harvard University, the Arnold Arboretum, founded in 1872, is the oldest public arboretum in America. The first director was Charles Sprague Sargent, who, from the 1890's established a three decade long programme of plant exploration in Asia.
(right click, open link in new tab) https://arboretum.harvard.edu/about/our-history/

Swedish medical doctor and zoologist who made collecting trips to Afghanistan in 1947 and 1957-1962.
(right click, open link in new tab) https://plants.jstor.org/stable/10.5555/al.ap.person.bm000152397