Page author: David Giblin
Rhododendron columbianum
mt. Labrador tea, smooth Labrador tea, western Labrador tea
WTU specimens
Other herbaria

Distribution: Occurring on both sides of the Cascades in Washington; British Columbia and Alberta south to California, east to Montana, Wyoming, and Utah.

Habitat: Swamps and bogs, lowlands to mid-elevations in the mountains.

Flowers: June-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

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

Leaves:

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:

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.

Fruit:

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. 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]
Rhododendron neoglandulosum Harmaja
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.

38 photographs:
Group by