Figure 5

Estimated timing and tempo of diversification in Burmanniaceae. (a) BEAST chronogram of the ingroup with multiple accessions for the same species excluded. Grey branches indicate achlorophyllous species. Branches with significant diversification rate shifts are numbered; shifts 1 and 2 are supported by Δ1, Δ2, and Slowinski and Guyer statistics; shifts 3–6 are supported by the relative cladogenesis statistic. Burmannia (excluding B. congesta) and Gymnosiphon clades are highlighted with grey bars, with two drawings of specimens as exemplars. (b) Semilogarithmic lineage-through-time (LTT) plot of Burmanniaceae (red) and simulated LTT plot with 95% confidence intervals (grey) with a constant death-birth rate of 0.5. Upturns or downturns in the empirical LTT plot reflect changes in diversification rate. Prolonged periods of increased diversification rate are highlighted by shaded areas.