R. tephropeplum
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subgenus Rhododendron section Rhododendron subsection Tephropepla
Rhododendron auritum Rhododendron hanceanum Rhododendron longistylum ssp. decumbens Rhododendron longistylum ssp. longistylum Rhododendron tephropeplum Rhododendron tsinlingense Rhododendron xanthostephanum SEE THE WHOLE 1998 CLASSIFICATION
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