Sa tacsanomaíocht bitheolaíochta, is éard is '''treibh''' ann ná an aicme tacsanomaíoch os cionn <nowiki>[[speiceas]]</nowiki>, ach faoi <nowiki>[[Fine|fhine]]</nowiki>, agus <nowiki>[[fofhine|fhofhine]]</nowiki>. ..<ref>{{citation|author1=McNeill, J.|author2=Barrie, F.R.|author3=Buck, W.R.|author4=Demoulin, V.|author5=Greuter, W.|author6=Hawksworth, D.L.|author7=Herendeen, P.S.|author8=Knapp, S.|author9=Marhold, K.|author10=Prado, J.|author11=Prud'homme Van Reine, W.F.|author12=Smith, G.F.|author13=Wiersema, J.H.|author14=Turland, N.J.|year=2012|volume=Regnum Vegetabile 154|title=International Code of Nomenclature for algae, fungi, and plants (Melbourne Code) adopted by the Eighteenth International Botanical Congress Melbourne, Australia, July 2011|publisher=A.R.G. Gantner Verlag KG|isbn=978-3-87429-425-6|url=http://www.iapt-taxon.org/nomen/main.php?page=titleteideal}} Article 4</ref><ref>{{cite book|author=[[International Commission on Zoological Nomenclature]]|year=1999|title=International Code of Zoological Nomenclature|edition=Fourth|publisher=International Trust for Zoological Nomenclature, XXIX|pages=306}}</ref> In amanna, foroinntear é i bhfoththreibheannabhfothreibheanna. Tagann an focal ón [[An Laidin|Laidin]]: <nowiki>''genus''</nowiki> "géineas").
