1. Dep. of Plant Sciences, 166 Loftsgard Hall; North Dakota State Univ.; Fargo ND 58108-6050
2. USDA-ARS, Sunflower and Plant Biology Research Unit; Northern Crop Science Laboratory; 1307 18th St. N. Fargo ND 58102
3. Agronomy Dep.; Iowa State Univ., North Central Regional Plant Introduction Station (NCRPIS), USDA-ARS/ISU; 1305 State Ave Ames IA 50014