This image shows a scenic section of Tennessee highway featuring wild Rhododendrons growing alongside the road.
The description states:
RHODODENDRON
The colorful flower of the Smokies, rhododendron gives a vivid hue to the rugged mountain scenery.
— Rhododendrons are a shrub flower and grow commonly throughout the Southeastern United States.
This card was used and is dated 19 June 1961.