Multidimensional scaling (MDS) plots of 79 Bituminaria bituminosa accessions from three botanical varieties from the Canary Islands and the Mediterranean region. Each MDS plot was generated from pairwise Euclidean distances of all 79 accessions (2D stress = 0.23) with each plot showing the position of additional breeding lines (denoted by "+" signs) from botanical varieties: a) var. albomarginata; b) var. bituminosa (Canary Islands); c) var. bituminosa (Mediterranean region); and d) var. crassiuscula.