1. Agricultural Genetic Resources Preservation Research Unit USDA‐ARS Fort Collins CO 80521 USA
2. Plant Introduction Research Unit USDA‐ARS and North Central Regional Plant Introduction Station Ames IA 50011 USA
3. International Potato Center CIP Lima 12 Peru
4. Department of Horticulture and of Ecology, Evolution, and Organismal Biology Iowa State University Ames IA 50011 USA