Fig. 2. Cluster dendrogram of 20 smooth bromegrass populations based on 83 RAPD marker band frequencies. Populations are abbreviated as follows: A = Alpha, B = WB19e, L = Lincoln, S = WB88S, 0 = original population, 1 = Cycle 1, 2 = Cycle 2, "+" = high NDF, and "-" = low NDF.