Commelinidae

Commelinidae is a botanical name at the rank of subclass. of the subclass will vary with the being used (there are many such systems); the only requirement being that it includes the family Commelinaceae. A well-known system that did use this name is the Cronquist system (1981), but it was also used by the Takhtajan system:

In the Takhtajan system treats this as one of six subclasses within the class Liliopsida (=monocotyledons). It consists of

In the Cronquist system treats this as one of four subclasses within the class Liliopsida (=monocotyledons). It consists of:

The APG II system does not use formal botanical names above the rank of order; most of the plants involved here are assigned to the clade commelinids in the monocots (its predecessor, the APG system used the clade commelinoids).

...
Wikipedia