Trees are sorted by their mixed base representation, treating their leaves in the order of their labels (i.e. alphabetically, if leaves are labelled with text).
# S3 method for multiPhylo
sort(x, decreasing = FALSE, na.last = NA, ...)
# S3 method for phylo
==(e1, e2)
# S3 method for phylo
<(e1, e2)
# S3 method for phylo
>(e1, e2)
# S3 method for MixedBase
==(e1, e2)
# S3 method for MixedBase
<(e1, e2)
# S3 method for MixedBase
>(e1, e2)
As in sort()
.
Objects to be compared.