Liliopsida consists of 4 sub-classes, 20 classes and 65 genera. The sub-classes are:
(i) Alismatidae: Class number of Alismatidae is 3.
(ii) Lilidae: Class number of Lilidae is 3.
(iii) Arecidae: The class number of Arecidae is 5.
(iv) Commelinidae: The class number of Commelinidae is 6.