| Noun | 1. | Azaleastrum - group of evergreen or deciduous shrubs formerly considered a separate genus; now included in the genus Rhododendrondilleniid dicot genus - genus of more or less advanced dicotyledonous trees and shrubs and herbs genus Rhododendron - large genus of evergreen shrubs native to cooler regions of the northern hemisphere having showy flowers azalea - any of numerous ornamental shrubs grown for their showy flowers of various colors |