Rhododendron | rhododendron | Rhododendron ponticum | Rhododendron tomentosum | Rhododendron luteum | American Rhododendron Society | Union de l'Europe Occidentale | Trifolium occidentale | Rhododendron vaseyi | Rhododendron subg. Hymenanthes | Rhododendron selense | Rhododendron rex | Rhododendron neoglandulosum | Rhododendron ferrugineum | Rhododendron aberconwayi | MV ''Rhododendron'' | MV Rhododendron | Melezzo Occidentale | Cirsium occidentale |
In addition to a focus on Northwest native plants, the Arboretum has one of the world's largest collections of the Western Azalea (Rhododendron occidentale), with over 200 selections of the species.