1. Natl. Forage Seed Production Res. Ctr., USDA‐ARS3450 SW Campus WayCorvallisOR97331
2. Dep. of AgronomyUniv. of WisconsinMadisonWI53706
3. Plant Genetics Unit, USDA‐ARSColumbiaMO65211
4. Vegetable and Forage Crops Production, USDA‐ARSProsserWA99530