1. USDA–ARS Forage Seed and Cereal Research Unit Prosser WA 99350 USA
2. The Land Institute Salina KS 67401 USA
3. USDA–ARS Forage & Range Research Lab Logan UT 84322 USA
4. Dep. of Agronomy and Plant Genetics Univ. of Minnesota St. Paul MN 55108 USA