Wordnet 3.0
NOUN (1)
1. 
 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, subclass Asteridae]
WordNet (r) 3.0 (2006):
subclass Asteridae
    n 1: 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, subclass
         Asteridae]