Charles Elmer Allen (October 4, 1872 in Horicon, Wisconsin – June 25, 1954) was an American botanist and cell biologist whose discoveries include the first documentation of sex chromosomes in plants.
[1] He was a member of the United States National Academy of Sciences and the American Philosophical Society,[2][3] and held presidencies of the Botanical Society of America (1921), the Wisconsin Academy of Sciences, Arts and Letters (1931-1933), the American Society of Naturalists (1936), and the American Microscopical Society (1948).
Allen was a professor at the University of Wisconsin for over 20 years.
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