1832-1902, American cabinet officer, b. Adams, N.Y. He settled (1854) in Nebraska, founded the Nebraska City News, and served (1858-61) as territorial secretary. In 1872 he originated Arbor Day, which since 1885 has been a legal holiday in Nebraska on Apr. 22, Morton's birthday. He was Secretary of Agriculture (1893-97) under Grover Cleveland. His landed estate at Nebraska City became a memorial park.