aaw_022 December 20, 2018February 5, 2019 Matthew Caulkins, Web Applications Program Manager Previous Next M-30. Ulmus americana Massachusetts (South Natick). Tree 90 ft. x 15 ft. Photograph by E.H. Wilson, December 26, 1923. All photographs by Ernest Henry Wilson. Copyright © President and Fellows of Harvard College, Arnold Arboretum Archives; all rights reserved.