Source : WordNet®

subclass Asteridae
     n : a group of mostly sympetalous herbs and some trees and
         shrubs mostly with 2 fused carpels; contains 43 families
         including Campanulales; Solanaceae; Scrophulariaceae;
         Labiatae; Verbenaceae; Rubiaceae; Compositae; sometimes
         classified as a superorder [syn: {Asteridae}]