query: # taxa where taxon name contain chrysocalyx
  SELECT ?item ?stat ?taxon_name ?pub_date WHERE {
    ?item p:P225 ?stat . 
    ?stat ps:P225 ?taxon_name.
    filter contains (?taxon_name, "chrysocalyx")
    optional {?stat pq:P577 ?pub_date.}   
  }
  ORDER BY ?taxon_name 
  
  