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Rhododendron albiflorum Hook.
Cascade Azalea, White Rhododendron
Ericaceae (Heath Family)
USDA Symbol: rhal2
USDA Native Status: L48 (N), CAN (N)
A shrub with 1-4 white, bowl-shaped flowers clustered in leaf axils along the stem.
This species does not produce the spectacular brilliant flowers that many of its relatives do, yet its dainty clusters of mildly citrus-scented white flowers and bright green leaves are delightful. The genus name comes from the Greek rhodon ("rose") and dendron ("tree").
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Breeding System: Flowers Bisexual
Fruit Type: Capsule
Size Notes: Up to about 8 feet tall.
Bloom InformationBloom Color: White , Yellow
Bloom Time: May , Jun , Jul , Aug
Bloom Notes: Usually white, rarely with yellow marks.
DistributionUSA: CO , ID , MT , OR , WA
Native Distribution: British Columbia; south to Oregon; east to western Montana.
Native Habitat: Wet places in the mountains.
Growing ConditionsWater Use: High
Light Requirement: Sun , Part Shade , Shade
Soil Moisture: Dry , Moist , Wet
CaCO3 Tolerance: None
BenefitWarning: Rhododendrons contain poisonous substances and should not be ingested by humans or animals. Honey made from flowers also may be toxic. POISONOUS PARTS: All parts. Highly Toxic, May be Fatal if eaten. Symptoms include salivation, watering of eyes and nose, abdominal pain, loss of energy, depression, nausea and vomiting, diarrhea, weakness, difficult breathing, progressive paralysis of arms and legs, coma. Toxic Principle: Andromedotoxin. (Poisonous Plants of N.C.)
Conspicuous Flowers: yes
Value to Beneficial InsectsSpecial Value to Bumble Bees
This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.
National Wetland Indicator Status
Web ReferenceWebref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter
Additional resourcesUSDA: Find Rhododendron albiflorum in USDA Plants
FNA: Find Rhododendron albiflorum in the Flora of North America (if available)
Google: Search Google for Rhododendron albiflorum
MetadataRecord Modified: 2023-04-03
Research By: TWC Staff