1. Key is a synthetic alfalfa variety selected from the Shenandoah alfalfa variety by phenotypic recurrent selection for resistance to verticillium wilt. the pea aphid, and the spotted alfalfa aphid. The germplasm of Key consists of 100⁰/o of the variety Shenandoah. The gerinpiasm sources of Key are considered to be largely Flemish and Chilean with estimates as follows: M.Falcata = 3%. Ladak = 1%, M.varla = 15%. Turklstan = 5%. Flemish = 40%. Chilean = 25%, unknown = 11%.

2. Key is adapted to and