1. Dep. of Soil and Crop Sciences Colorado State Univ. Fort Collins CO80523
2. USDA‐ARS National Laboratory for Genetic Resources Preservation 1111 S. Mason St. Fort Collins CO 80521
3. USDA‐ARS, Plant Introduction Research Unit, Dep. of Agronomy Iowa State Univ. Ames IA 50011
4. Plant Breeding and Genetics Section, School of Integrative Plant Science Cornell Univ. Ithaca NY 14853
5. USDA‐ARS, Vegetable Crops Research Unit, Dep. of Horticulture Univ. of Wisconsin Madison WI 53706
6. Dep. of Agronomy Iowa State Univ. Ames IA 50011