Rhododendron columbianum - Western Labrador tea - up to 2 m (7 feet) tall, spreading by means of underground rhizomes. The evergreen leaves are ovate to lanceolate, fragrant when crushed. Flowers are white to cream, borne in groups of 10-35. used medicinally as a tea astringent, diaphoretic, diuretic and laxative properties. toxic if the tea is allowed to steep too long. The fragrance of the leaves shown useful in repelling insects and rodents.