Page authors: Don Knoke, David Giblin
Rhododendron columbianum
mountain Labrador-tea, smooth Labrador-tea, western Labrador-tea

Distribution: Occurring west of the Cascades crest in lowland western Washington; British Columbia to California,

Habitat: Swamps and bogs at low elevations.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Evergreen shrubs 0.5-2 m. tall, the twigs puberulent and glandular-dotted.


Leaves alternate, evergreen, ovate to oblong-ovate, deep green on the upper surface and grayish-green and densely glandular on the lower, more or less revolute, 3-4 cm. long and about as broad.


Flowers many in short, terminal racemes; pedicels 1-2 cm. long; calyx small, 5-parted nearly to the base; petals 5, distinct to the base, white, nearly rotate; stamens 8-12, longer than the style, the anthers without awns, opening by pores near the tip; ovary superior.


Capsule 5-valved, ovoid to globose, 3-6 mm. long, puberulent and glandular.

Accepted Name:
Rhododendron columbianum (Piper) Harmaja
Publication: Ann. Bot. Fenn. 27: 203. 1990.

Synonyms & Misapplications:
Ledum glandulosum Nutt. [HC]
Ledum glandulosum Nutt. ssp. australe C.L. Hitchc.
Ledum glandulosum Nutt. ssp. columbianum (Piper) C.L. Hitchc.
Ledum glandulosum Nutt. ssp. olivaceum C.L. Hitchc.
Ledum glandulosum Nutt. var. californicum (Kellogg) C.L. Hitchc.
Ledum glandulosum Nutt. var. columbianum (Piper) C.L. Hitchc. [HC]
Ledum glandulosum Nutt. var. glandulosum [HC]
Additional Resources:

PNW Herbaria: Specimen records of Rhododendron columbianum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Rhododendron columbianum checklist entry.

E-Flora BC: Rhododendron columbianum atlas page.

CalPhotos: Rhododendron columbianum photos.

USDA Plants: Rhododendron columbianum information.

16 photographs:
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