Figure 1. Phylogenetic interrelationships of the orders of flowering plants, compiled from recent cladistic analyses cited in the text. Jackknife support is given on the branches (a dash for values <50%), first jackknife values from analysis of 545 sequences of the rbcL, atpB, and 18S rDNA genes (D. E. Soltis, M. W. Chase, P. S. Soltis, D. Albach, M. E. Mort, V. Savolainen, M. Zanis, and J. S. Farris, unpublished, in preparation) and second jackknife values from analysis of 2538 rbcL sequences (Källersjö et al., 1998).