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Rhododendron Californicum
- medium-sized rhododendron of Pacific coast of North America having large rosy brown-spotted flowers
Rhododendron Maxima
- late-spring-blooming rhododendron of eastern North America having rosy to pink-purple flowers
Rhododendron Viscosum
- shrub growing in swamps throughout the eastern United States and having small white to pinkish flowers resembling honeysuckle
Richea Dracophylla
- stout Australian shrub with narrow leaves crowded at ends of branches and terminal clusters of white or pink flowers
Richea Pandanifolia
- gaunt Tasmanian evergreen shrubby tree with slender tapering leaves 3 to 5 feet long
Russian Olive
- deciduous shrubby tree of Europe and western Asia having gray leaves and small yellow fruits covered in silvery scales; sometimes spiny
Rhizophora Mangle
- a tropical tree or shrub bearing fruit that germinates while still on the tree and having numerous prop roots that eventually form an impenetrable mass and are important in land building
Ravenala Madagascariensis
- giant treelike plant having edible nuts and leafstalks that yield a refreshing drink of clear watery sap; reputedly an emergency source of water for travelers
Reseda Odorata
- Mediterranean woody annual widely cultivated for its dense terminal spikelike clusters greenish or yellowish white flowers having an intense spicy fragrance
Reseda Luteola
- European mignonette cultivated as a source of yellow dye; naturalized in North America