⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-12300613, with some changes.
This name is a synonym of Rhododendron columbianum (Piper) Harmaja.
The record derives from Tropicos which reports it as a synonym (record 12300613) with original publication details: Contr. U.S. Natl. Herb. 11: 441 441 1906.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:137006-2.