1) Class 2) Subclass rosidae 
Under the International Code of Nomenclature for algae, fungi, and plants (ICN), Rosidae is a botanical name at the rank of subclass. Circumscription of the subclass will vary with the taxonomic system being used; the only requirement being that it includes the family Rosaceae. Under Phylocode, Rosidae is a clade defined as the most inclusive crow...
(from the article `angiosperm`) ...stamens opposite the corolla lobes; placentation free-central or basal. Three families: Theophrastaceae, Myrsinaceae, and Primulaceae ...
[n] - a group of trees and shrubs and herbs mostly with polypetalous flowers
subclass Rosidae noun a group of trees and shrubs and herbs mostly with polypetalous flowers; contains 108 families including Rosaceae; Crassulaceae; Myrtaceae; Melastomaceae; Euphorbiaceae; Umbelliferae