As classified in WFO snapshot
December 2023
Warning: older classification
variety
Rhododendron californicum var. washingtonianum
Zabel ex Rehder
This variety name was first published in Cycl. Amer. Hort. [L.H.Bailey] 4: 1522. 1902
This variety name has been reclassified since this snapshot. Its current preferred usage is a synonym .