private boolean isUnique(TaxonList taxonList, Tree tree, NodeRef node) {
    Set<String> taxa = Tree.Utils.getDescendantLeaves(tree, node);
    int count = 0;
    for (String taxon : taxa) {
      count += (taxonList.getTaxonIndex(taxon) >= 0 ? 1 : 0);
      // System.out.print(taxon + "\t");
    }
    boolean unique = (count == 0) || (count == taxa.size());

    // System.out.println(count + "\t" + unique);

    return unique;
  }