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Rudbeckia Serotina
- the state flower of Maryland; of central and southeastern United States; having daisylike flowers with dark centers and yellow to orange rays
Rudbeckia Laciniata
- tall leafy plant with erect branches ending in large yellow flower heads with downward-arching rays; grow in Rocky Mountains south to Arizona and east to the Atlantic coast
Rudbeckia Laciniata Hortensia
- very tall branching herb with showy much-doubled yellow flower heads
Russian Dandelion
- perennial dandelion native to Kazakhstan cultivated for its fleshy roots that have high rubber content
Rhode Island Bent
- common grass with slender stems and narrow leaves
Rhodes Grass
- perennial grass of South Africa introduced into United States; cultivated as forage grass in dry regions
Ravenna Grass
- grass often cultivated for its long white-ribbed leaves and large plumes resembling those of pampas grass
Rose Of China
- large showy Asiatic shrub or small tree having large single or double red to deep-red flowers
Rose Of Sharon
- Asiatic shrub or small shrubby tree having showy bell-shaped rose or purple or white flowers and usually 3-lobed leaves; widely cultivated in temperate North America and Europe
Radyera Farragei
- southern and western Australian shrub with unlobed or shallowly lobed toothed leaves and purple flowers; sometimes placed in genus Hibiscus