The figure legend reads:
Figure 4: Six-way Venn diagram showing the distribution of shared gene families (sequence clusters) among M. acuminata, P. dactylifera, Arabidopsis thaliana, Oryza sativa, Sorghum bicolor and Brachypodium distachyon genomes.
In case it wasn’t obvious, M. acuminata is the banana plant.
Full paper on the draft genomic sequence of the banana, and the info this divulged regarding its evolution is available for free downloading at Nature.
REF: The banana (Musa acuminata) genome and the evolution of monocotyledonous plants. Angélique D’Hont, France Denoeud, et al. Nature (2012) doi:10.1038 / nature11241 (published online July 11, 2012)