1 U.S. Department of Agriculture, Agricultural Research Service, U.S. National Arboretum, Floral and Nursery Plants Research Unit, Otis L. Floyd Nursery Research Center, 472 Cadillac Lane, McMinnville, TN 37110
2 Otis L. Floyd Nursery Research Center, Department of Agriculture and Environmental Science, Tennessee State University, McMinnville, TN 37110
3 Department of Horticultural Sciences, Texas A&M University, College Station, TX 77843-2133
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