FIGURE 1.

Maximum clade credibility chronogram of the Cirrhopetalum alliance clade (CAC) and its sister group. Asterisk indicates nodes with posterior clade probabilities (PP) < 0.95; otherwise, PP ≥ 0.95. Node numbers correspond with those in Supplementary Table 4. The inserted curve (A) represents estimated mean atmospheric CO₂ concentration change based on palaeoclimatic pCO₂ data extracted from Foster et al. (2017); the inserted phylorate plot (B) corresponds to the topology of CAC, showing net species diversification rate (lineage/Myr; cool colours = slow, warm = fast). B., Bulbophyllum; Ma, million years ago; Pl., Pleistocene; Pli., Pliocene.