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Montana Field Guides

Glandular Labrador-tea - Ledum glandulosum
Other Names:  Ledum groenlandicum ssp. glandulosum, Rhododendron columbianum

Native Species

Global Rank: G5
State Rank: S4
C-value: 7

Agency Status


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General Description
Stems erect-ascending, sparingly branched, to 120 cm; floral buds terminal, globose; foliage buds lateral, ovoid, closely crowded beneath the larger floral bud. Leaves alternate, petiolate, leathery; to ca. 15 mm long, elliptic to obovate, entire, dark green above, whitish, yellow glandular-dotted below. Inflorescence a crowded, umbel-like raceme of many flowers borne from the distal floral bud of last year’s stem, pedicels to 2 cm long. Flowers hypogynous, 5-merous; sepals, white, glandular, nearly separate; corolla dish-shaped; petals separate, white, oblong; stamens 10; ovary superior. Fruit an ovoid, 5-chambered capsule (Stickney in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are variety glandulosum.

Diagnostic Characteristics

Species Range
Montana Range Range Descriptions


Observations in Montana Natural Heritage Program Database
Number of Observations: 280

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Moist to wet forests and meadows; valleys to subalpine (Stickney in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus vagans and Bombus ternarius (Colla and Dumesh 2010).

  • Literature Cited AboveLegend:   View Online Publication
    • Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141:39-68.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Clark, D. 1991. The effect of fire on Yellowstone ecosystem seed banks. M.Sc. Thesis. Montana State University, Bozeman. 115 pp.
    • Gaffney, W.S. 1941. The effects of winter elk browsing, South Fork of the Flathead River, Montana. Journal of Wildlife Management 5(4):427-453.
    • Hawkins, P.H. 1903. The alpine flora of Montana. M.Sc. Thesis, Bozeman, MT: Montana State University. 24 pp.
    • Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
    • Law, D.J. 1999. A comparison of water table dynamics and soil texture under black cottonwood recent alluvial bar, beaked sedge, and Geyer's/Drummond's willow communities. M.Sc. Thesis. Bozeman, MT: Montana State University. 68 p.
    • Tyers, D.B. 2003. Winter ecology of moose on the Northern Yellowstone Winter Range. Ph.D. Dissertation. Bozeman, MT: Montana State University. 308 p.
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Citation for data on this website:
Glandular Labrador-tea — Ledum glandulosum.  Montana Field Guide.  .  Retrieved on , from