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Rhododendrons are divided into four main groups:
By convention, species names are shown in lower case, such as R. maximum, while hybrid names are shown with initial capital letters and enclosed in single quotes, such as R. 'Millie Mac'.
- small-leaf = scaly-leaf = lepidote rhododendrons
- large-leaf = non-scaly-leaf = elepidote rhododendrons
- evergreen azaleas
- deciduous azaleas