Table 1.

Summary of Cophylogenetic Analyses

Gene	Species	Sequences	Observed Cost	Random Cost (mean)	P Value
DPO	20	24	27	31.34	0.017
DPO	23	28	32	37.84	0.002
RPO	19	24	26	31.84	0.008
RPO	23	28	32	38.42	0.004
Concatenated	20	27	27	39.85	<0.001
Concatenated	34	39	48	56.38	<0.001

Note.—For each data set, the observed cost is the minimum total event costs identified as being needed to reconcile the plasmid gene tree with the angiosperm phylogeny. Lower costs are indicative of more congruent trees. The random cost is derived from the mean of 1,000 permutations of the data set (random tip mappings), and the P value indicates where the observed cost falls within that random distribution. Two different analyses are reported for each gene/concatenation, corresponding to the full and reduced taxon samplings described in the Materials and Methods.