Figure 1. Phylogenetic tree showing divergence times and the evolution of gene family sizes.
The phylogenetic tree shows the topology and divergence times for 15 plant species. As expected, as a member of the Apostasioideae, A. shenzhenica is sister to all other orchids. In general, the estimated orchid divergence times are in good agreement with recent broad scale orchid phylogenies2,3. Divergence times are indicated by light blue bars at the internodes; the range of these bars indicates the 95% confidence interval of the divergence time. Numbers at branches indicate the expansion and contraction of gene families (see Methods and Extended Data Fig. 2). MRCA, most recent common ancestor. The number in parentheses is the number of gene families in the MRCA as estimated by CAFÉ11.