CHAPTER III. Nomenclature of taxa according to their rank
SECTION 1. Names of taxa above the rank of family
Automatically typified names of orders or suborders are to end in -ales (but not -virales) and -ineae, respectively (see Art. 16.3 and 32.2).
Names intended as names of orders, but published with their rank denoted by a term such as “cohors”, “nixus”, “alliance”, or “Reihe” instead of “order”, are treated as having been published as names of orders.
A new name should not be published for an order for which a name already exists that is based on the same type as the name of an included a family.