Rhododendron sect. Pentanthera

Rhododendron" sect. "Pentanthera is a section of subgenus "Pentanthera" in the genus "Rhododendron". It comprises 15-16 species of deciduous shrubs native to temperate regions of the Northern Hemisphere.
It includes two subsections:
Subsection Sinensia (1 species).
The section is closely related to sect. "Rhodora", differing from it in the flower corolla having five fully developed lobes, whereas sect. "Rhodora" has the upper three lobes joined into a single three-lipped lobe.
Cultivation.
Most (but not all) of the cultivated azaleas belong to species in this section, and hybrids derived from them.