Doyle, J.J., Doyle, J.L., Ballenger, J.A., Dickson, E.E., Kajita, T. and Ohashi, H. (1997) A phylogeny of the chloroplast gene rbcl in the Leguminosae: Taxonomic cor-relations and insights into the evolution of nodulation. American Journal of Botany, 84, 541-554.