Rhododendron columbianum, commonly known as western Labrador tea, swamp tea, or muskeg tea, is a shrub that is widespread in the western United States and in western Canada, reported from British Columbia, Alberta, Washington, Oregon, Idaho, California, Montana, Wyoming, Utah, Nevada, and Colorado.

[3] Rhododendron columbianum is a shrub up to 2 m (6 ft 7 in) tall, spreading by means of underground rhizomes.

[4] The leaves grow very close to the stalk and their bottoms bear tiny white hairs.

[10] Results from molecular and nuclear phylogenetic analyses indicate that R. columbianum and R. tolmachevii make up a clade most closesly related to R. groenlandicum, R. hypoleucum, and R.

[11] Rhododendron columbianum has been used medicinally as a tea astringent, diaphoretic, diuretic and laxative properties.