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All azaleas are classified under genus Rhododendron, which contains eight formalized groups. Two of these, known as subgeneras, contain azaleas, one evergreen and one deciduous. There is no official genus azalea - all are listed under Rhododendron with azalea strictly a common name.

Those plants that were developed from Rhododendron nudiflorum populate the subgenus Pentathera. Those developed from evergreen Rhododendron tsutsusi are evergreens. Today most plants sold are complex varieties often known strictly by their varietal names such as 'Alaska'.

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16y ago

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