There are between 500 to 900 species of Rhododendron, which includes both rhododendrons and azaleas. They can be found across the Northern Hemisphere with a high concentration in western China, the Himalayas and Myanmar (Burma).
They vary from large trees to small shrubs and can be both evergreen and deciduous. Most are evergreen. They are popular because of their large, bright blossoms in spring and early summer and also because their leaves remain lustrous over winter providing a good backbone to a garden.
Now, the difference between rhododendrons and azaleas comes in the number of stamens in the flowers. Rhododendrons have 10 whereas azaleas only have 5.
Name Derivation: Comes from the Greek words rhodo meaning rose and dendron meaning tree.
Common Name: Rhodendron
Rhododendron is in the family Ericaceae.