作者单位：Western Regional Plant Introduction Station, Agricultural Research Service, United States Department of Agriculture, Washington State University, 59 Johnson Hall, Pullman, WA 99164-6402, USA[1]Arctic Plant Germplasm Research and Introduction Project, Subarctic Agricultural Research Unit, Agricultural Research Service, United States Department of Agriculture, 533 East Fireweed Avenue, Palmer, AK 99645-6629, USA[2]
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