United States National Arboretum contribution
U.S. Dept. of Agriculture, Agricultural Research Service
by Frederick G. Meyer, Peter M. Mazzeo, and Donald H. Voss
U.S. Dept. of Agriculture, Agricultural Research Services 1994 United States National Arboretum contribution no. 7
所蔵館3館
by Roland M. Jefferson and Alan E. Fusonie
Agricultural Research Service, U.S. Dept. of Agriculture 1977 United States National Arboretum contribution no. 4
所蔵館10館