- A taxonomic subclass within the class Liliopsida – the grasses, rushes, sedges and similar plants, now included in the commelinids. [since 1967]
- Under APG III (2009), the members of this group have become the core of the commelinids, a clade which also includes the palms and gingers. The Commelinidae subclass is likely to become dated.
- (subclass): Poales, Commelinales, Zingiberales - orders
- Bromeliales, Cyperales, Eriocaulales, Juncales, Typhales - now families in Poales