C. dura is not listed as a synonym for C. intractana on ALA however ? but is here https://bie.ala.org.au/species/https://biodiversity.org.au/afd/taxa/1a12f011-14c4-424a-ba9a-dc93afbdb03e#names C. intractana see/c.f. https://inaturalist.ala.org.au/observations/291104500 https://inaturalist.ala.org.au/observations/295317110 https://inaturalist.ala.org.au/observations/289200845