Source: Large shrub with erect and spreading branches and thick twigs. Leaves evergreen, 3–8 in. long, oblong, leathery, entire, with sunken midvein, upper side dark green. Flowers pink to rose-purple, 1–1 1/2 in.; 5 petals fused at base form a wide shallow bell with tips spreading wide. Grows in moist to dry coniferous forests from coast to high elevations. State flower of Washington.
Rarity: Locally Common
Flowering Time: Late Spring, Early Summer
Life Cycle: Perennial
Height: 3--15 feet
Habitat: West-Side Forest, Coastal
Found In: West Gorge, Olympic Np
Native: Yes
Source: https://www.pnwflowers.com/flower/rhododendron-macrophyllum
Additional resource: https://oregonflora.org/taxa/index.php?taxon=7850