Affiliation: | Tokyo Metropolitan Mizuho-nogei High School, 2027 Ishihata, Mizuho, Tokyo 190-1211, Japan; Institute of Agriculture and Forestry, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan; Tsukuba Botanical Garden, National Science Museum, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan |