|Rhododendron calendulaceum at Craggy Gardens, North Carolina|
It is a deciduous shrub, 120–450 cm tall. The leaves are simple, 3–7 cm long, slightly dull green above and villous below. The arrangement is generally alternate, however they appear whorled towards the tips of the branches.
The flowers are 4–5 cm long, usually bright orange, but can vary from pastel orange to dark reddish-orange. These non-fragrant flowers have 4-5 lobes and grow in clusters of 5-10. It typically blooms in late May and early June.
This species of Rhododendron is native to the Appalachian Mountains in the eastern United States, ranging from southern Pennsylvania and Ohio to northern Georgia. It has been reported historically in New York and Maryland, however its current native status in these states is undetermined. However, it can occur as an introduced species in anthropogenic habitats. It occurs naturally in mixed deciduous forests.
- Golden Sunset Flame
- Golden Yellow Flame
- Smokey Mountaineer
It is also an important parent species in hybrid Azaleas, such as:
- Knap Hill
- Maid in the Shade
- Northern Lights
Rhododendron calendulaceum by Ellis Rowan, 1901
- "Rhododendron calendulaceum". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 21 October 2015.
- "Rhododendron calendulaceum (flame azalea): Go Botany". gobotany.nativeplanttrust.org. Retrieved 2020-06-10.
- "Rhododendron calendulaceum (Flame Azalea) | North Carolina Extension Gardener Plant Toolbox". plants.ces.ncsu.edu. Retrieved 2020-06-10.
- Brand, Mark H. "Plant Database". www.hort.uconn.edu. Retrieved 2020-06-10.
- Carey, Jennifer H. (1994). "Rhododendron calendulaceum". www.fs.fed.us. Retrieved 2020-06-10.
- "Deciduous Azaleas". www.rhodyman.net. Retrieved 2020-06-10.
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