The botanical sub-class Rosidae is large, containing over 58000 species grouped within 108 families. The families are botanically diverse and examples are: Rosaceae; Crassulaceae; Myrtaceae; Melastomaceae; Euphorbiaceae; Apiaceae (old: Umbelliferae).

Members of the sub-class typically have features such as pinnately compound leaves, and multi-petalled flowers.