rosebay: late-spring-blooming rhododendron of eastern North America having rosy to pink-purple flowers
rhododendron: any shrub of the genus Rhododendron: evergreen shrubs or small shrubby trees having leathery leaves and showy clusters of campanulate (bell-shaped) flowers
reserpine: antihypertensive consisting of an alkaloid extracted from the plant Rauwolfia serpentina (trade names Raudixin or Rau-Sed or Sandril or Serpasil)