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Systematic position of Calycopeplus shown on summary tree of relationships in Euphorbieae, based on Steinmann and Porter's (2002) weighted maximum parsimony analysis of the ITS region (bootstrap percentages >50% above branches). Clade 1 = Anthosteminae, 2 = Neoguillauminiinae, 3 = Euphorbiinae. Number and distribution of species are shown in parentheses below taxon name (Modified from Prenner and Rudall 2007).
