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Figure 4 | BMC Evolutionary Biology

Figure 4

From: Diversification of myco-heterotrophic angiosperms: Evidence from Burmanniaceae

Figure 4

The relationship between γ and the proportion of extant taxa in Burmanniaceae ( f ). We sampled 41 species of Burmanniaceae and measured a γ-value of -6.51 using the BEAST chronogram (blue dotted line). To explore the effects of missing lineages we generated γ-statistic values under the assumption that our sampling n (n = 41) represents only a proportion (f) of the extant Burmanniaceae species. The three curves show the mean, 0.975 percentile, and 0.025 percentile of the γ-distribution. This distribution was constructed by calculating γ of 1000 simulated pure-birth phylogenies with n/f tips, each randomly pruned to 41 tips, for values of f ranging from 0.018 to 0.5. To measure a γ-value of -6.51 using 41 taxa while the actual value is not significantly different from zero, Burmanniaceae should contain 562 lineages (95% CI: 139–1708). Currently 92 Burmanniaceae species are known [60].

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