p>A character vector with taxon names to be maintained in tree</p></dd>


<dt>missing_taxa</dt>
<dd><p>A tree, a data frame or a vector enlisting all missing taxa you want to include.</p><dl><dt>A tree</dt>
<dd><p>Either as a phylo object or as a newick character string.
It contains all taxa that you want at the end, both missing and non missing.
This tree will be used as a hard constraint.</p></dd>

<dt>A <code>data.frame</code></dt>
<dd><p>It contains two columns named "taxon" and "clade".
The first one c