Definition that contains genus rhododendron
- rhododendron any shrub of the genus Rhododendron: evergreen shrubs or small shrubby trees having leathery leaves and showy clusters of campanulate (bell-shaped) flowers
- subgenus azalea group of evergreen or deciduous shrubs formerly considered a separate genus; now included in the genus Rhododendron
- subgenus azaleastrum group of evergreen or deciduous shrubs formerly considered a separate genus; now included in the genus Rhododendron
- azaleastrum group of evergreen or deciduous shrubs formerly considered a separate genus; now included in the genus Rhododendron