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Regressions of crown age against clade size. For each of 250 Banksia phylogenies sampled from the Bayesian posterior distribution, a set of independent clades was identified by counting six nodes down from the root. Regressions were fitted across these clades, giving 250 slope estimates. The open circles and bars represent the median and HPD of the crown age estimates for the two non-SWBP Banksia clades.
