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Montana Field Guide

Montana Field Guides

Rocky Mountain Maple - Acer glabrum

Native Species

Global Rank: G5
State Rank: S5

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Large monoecious or dioecious, shrubs or small trees up to 15 m. Twigs glabrous, red to purple. Leaves ovate-cordate, glabrous, 3–12 cm across, 3- to 5-lobed, doubly serrate; petioles red. Inflorescence a few-flowered panicle on short leafy side shoots. Flowers functionally unisexual; sepals and petals 3–4 mm long, yellowish, distinctly veined; stamens 8 to 10. Samara 2–4 cm long, the seed ca. 5 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
AK to AB south to CA, NM, NE. AK to AB south to CA, NM, and NE (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1732

(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, open, coniferous forest, riparian forests, avalanche slopes; valleys to lower subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Literature Cited AboveLegend:   View Online Publication
    • Hitchcock, C. L., A. Cronquist, M. Ownbey, and J. W. Thompson. 1961. Vascular Plants of the Pacific Northwest, Part 3. Saxifragaceae to Ericaceae. Seattle, WA and London, England: University of Washington. 614 pp.
    • 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?
    • Little, E.L., Jr. 1979. Checklist of United States trees (native and naturalized). Agriculture Handbook No. 541. U.S. Forest Service, Washington, D.C. 375 pp.
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Citation for data on this website:
Rocky Mountain Maple — Acer glabrum.  Montana Field Guide.  .  Retrieved on , from