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Montana Field Guides

White-flowered Rhododendron - Rhododendron albiflorum

Native Species

Global Rank: G5
State Rank: S3S4
C-value: 8

Agency Status


External Links

General Description
Deciduous, acutely branching shrub. Stems erect-ascending, to 150 cm, sparingly branched with coarse, reddish hairs; buds dimorphic; terminal bud foliaceous; floral buds lateral on last year’s stem. Leaves alternate, short-petiolate, thin; blades obovate, to ca. 8 cm long, bright glossy green when fresh, paler beneath, entire, minutely glandular-ciliate, usually with scattered, coarse, reddish hairs. Inflorescence of 1 to 2 flowers from lateral floral buds below the current season’s growth; pedicels ca. as long as the flowers. Flowers hypogynous, 5-merous; calyx foliaceous; corolla broadly bell-shaped, to 2 cm long, the rounded lobes as long as the tube, white; stamens 10; ovary superior. Fruit a 5-chambered capsule (Stickney in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range Range Descriptions


Range Comments
BC to MT south to OR and ID (Stickney in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 178

(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)

Open, moist, coniferous forests; upper montane, lower 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, Bombus flavifrons, Bombus melanopygus, Bombus mixtus, Bombus sitkensis, Bombus occidentalis, Bombus impatiens, Bombus insularis, Bombus bohemicus, and Bombus flavidus (Plath 1934, Thorp et al. 1983, Colla and Dumesh 2010, Koch et al. 2012, Williams et al. 2014).

  • 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.
    • Koch, J., J. Strange, and P. Williams. 2012. Bumble bees of the western United States. Washington, DC: USDA Forest Service, Pollinator Partnership. 143 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Plath, O.E. 1934. Bumblebees and their ways. New York, NY: Macmillan Company. 201 p.
    • Thorp, R.W., D.S. Horning, and L.L. Dunning. 1983. Bumble bees and cuckoo bumble bees of California (Hymenoptera: Apidae). Bulletin of the California Insect Survey 23:1-79.
    • Williams, P., R. Thorp, L. Richardson, and S. Colla. 2014. Bumble Bees of North America. Princeton, NJ: Princeton University Press. 208 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
White-flowered Rhododendron — Rhododendron albiflorum.  Montana Field Guide.  .  Retrieved on , from