Cascade Azalea, White Rhododendron, White-flowered Azalea: Rhododendron albiflorum (Synonyms: Azaleastrum albiflorum, Azaleastrum albiflorum ssp. warrenii, Rhododendron albiflorum var. albiflorum, Rhododendron albiflorum var. warrenii) -
Coastal Labrador Tea, Western Labrador Tea: Rhododendron columbianum (Synonyms: Ledum columbianum, Ledum xcolumbianum [Ledum glandulosum x Ledum groenlandicum], Ledum xcolumbianum, Ledum glandulosum, Ledum glandulosum ssp. australe, Ledum glandulosum ssp. columbianum, Ledum glandulosum var. columbianum, Ledum glandulosum ssp. olivaceum, Ledum glandulosum var. californicum, Ledum glandulosum var. columbianum, Ledum glandulosum var. glandulosum, Ledum groenlandicum ssp. glandulosum, Ledum glandulousm ssp. olivaceum, Rhododendron neoglandulosum)
Bog Labrador Tea, Bog Labrador-tea, Labrador Tea, Rusty Labrador-tea: Rhododendron groenlandicum (Synonym: Ledum palustre ssp. groenlandicum, Ledum palustre var. latifolium, Ledum groenlandicum) -
California Rhododendron, Pacific Rhododendron, Western Rhododendron: Rhododendron macrophyllum (Synonym: Rhododendron californicum) -
Western Azalea: Rhododendron occidentale (Synonyms: Azalea occidentalis, Rhododendron occidentale var. occidentale) -