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Lineage through time plot for diversification in North American Psoraleeae based on the total evidence maximum clade credibility chronogram (see Figure 1). All outgroups were culled from the chronogram until only North American Psoraleeae taxa remained, leaving Hoita, Rupertia, Psoralidium, Orbexilum, and Pediomelum. st = time of diversification rate shifts from yule3rate model estimates. r = diversification rate. Mya = million years ago.
