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| Description: In this chronogram, the rapid speciation of the modern orchids is dated to just after the K2T (Cretaceous Tertiary) mass extinction. The relative size of each clade is proportional to the number of genera in that clade, as indicated by the size of the shaded area. Adapted from Ramarez et al. (2007). Picture Stats: Views: 2239 Filesize: 166.58kB Height: 900 Width: 1012 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=5294 |