CDBCriteria DISTINCT doesn't appear to be working

Consider three tables: taxon (list of species), place (list of localities), record (contains list of species and localities). I wish to generate a unique list of species from a particular place. Note that there can be more than one species record from a particular locality but I only want the presence of the species, not every record. Here’s what I’ve tried:

                   $criteria = new CDBCriteria();

                   $criteria->distinct = TRUE;

                   $criteria->select = 't.taxon_id';

                   $criteria->with = array('formattedTaxon');

                   $criteria->addInCondition('place_id', $this->getPlaceDescendants());

                   return new CActiveDataProvider($this, array(

                           'criteria' => $criteria,

                           'sort' => array(

                                   'defaultOrder' => '"formattedTaxon".name',

                             ), 

                   )); 

It returns every record. FormattedTaxon is a view that is simply there to allow me to sort the list by the taxon name. If I remove the "with" and the "sort", it works!

What am I doing wrong?

Thanks!

B