swamp azalea: shrub growing in swamps throughout the eastern United States and having small white to pinkish flowers resembling honeysuckle
rhododendron: any shrub of the genus Rhododendron: evergreen shrubs or small shrubby trees having leathery leaves and showy clusters of campanulate (bell-shaped) flowers
johnson grass: tall perennial grass that spreads by creeping rhizomes and is grown for fodder; naturalized in southern United States where it is a serious pest on cultivated land