Principal coordinate analysis of 416 barley varieties. Growth habit (S = spring, W = winter) and ear-row number (2 = 2-row, 6 = 6-row) are indicated. VRN-H1 haplotype designations are previously described . 'Almunia', 'Athene', 'Birgit' and 'Express' (VRN-H1 haplotype 5C) are the only four winter varieties that do not belong to haplotype 1A. All included members of the spring VRN-H1 haplotype 1B form a sub-cluster within 6-row spring varieties (circled). The proportion of the total variation accounted for by component 1 (PCO1) and 2 (PCO2) is shown in brackets.