Additional file 2.
Chronogram of the unconstrained tree. Numbers after family name are species number considered for our analysis following Stevens  for angiosperms and gymnosperms, Crosby et al.  and Buck and Goffinet  for mosses, Smith et al.  for ferns and Stotler et al.  for liverworts. The x axis indicate time in million years. The placement of 11 families in which no molecular data could be collected are indicated; they were connected to node numbers as follows: 1 - Monocarpaceae, 2 - Sandeothallaceae, 3 - Chonecoleaceae, 4 - Grolleaceae, 5 - Trichotemnomaceae, 6 - Viridivelleraceae, 7 - Microtheliaceae, 8 - Sorapillaceae, 9 - Hapthantaceae, 10 - Balanophoraceae and 11 - Rafflesiaceae.
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Fiz-Palacios et al. BMC Evolutionary Biology 2011 11:341 doi:10.1186/1471-2148-11-341