query: # Tropicos taxa without taxon authors 
  SELECT ?item ?taxon_name ?tropicosLink   WHERE {
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
    ?item p:P225 ?stat . 
    ?stat ps:P225 ?taxon_name.
    ?item wdt:P960 ?tropicos_id.
    bind(uri(concat("http://legacy.tropicos.org/Name/",?tropicos_id)) as ?tropicosLink)  
    MINUS {?stat pq:P405 ?taxon_author.} 
  }
  