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Species Details
Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium Read more about this collection »
LeavesOpposite, thin and hairless; 3-10 cm wide; 2.5-6 cm long; palmate with 3-5 lobes; taper to a point; irregular margins doubly serrate (Moss, 1983). Shiny dark green above, paler beneath (Nesom, 2006).
FlowersInflorescence 5-15 flowers; unisexual, monecious or dioecious (Moss, 1983). Greenish yellow; petals axillary flat-topped clusters; 2-5 cm long on drooping stalks (Nesom, 2006). 5 separate petals; 1 pistil; superior ovary; 2 carpels; 2 styles; 8-10 stamens (Moss, 1983).
Fruits and SeedsFruits in samaras 2-4 cm long; 2 united basally each with 1 seed (Moss, 1983); reddish when mature; long stalk; widely spread pair (Nesom, 2006).
Scientific Name
Acer glabrum Torr.
Common Name
mountain maple
General Description
A shrub or tree up to 10 m tall with young branches that are reddish-brown and older stems that are grey (Moss, 1983).
Leaves
Opposite, thin and hairless; 3-10 cm wide; 2.5-6 cm long; palmate with 3-5 lobes; taper to a point; irregular margins doubly serrate (Moss, 1983). Shiny dark green above, paler beneath (Nesom, 2006).
Flowers
Inflorescence 5-15 flowers; unisexual, monecious or dioecious (Moss, 1983). Greenish yellow; petals axillary flat-topped clusters; 2-5 cm long on drooping stalks (Nesom, 2006). 5 separate petals; 1 pistil; superior…
Inflorescence 5-15 flowers; unisexual, monecious or dioecious (Moss, 1983). Greenish yellow; petals axillary flat-topped clusters; 2-5 cm long on drooping stalks (Nesom, 2006). 5 separate petals; 1 pistil; superior ovary; 2 carpels; 2 styles; 8-10 stamens (Moss, 1983).
Fruits and Seeds
Fruits in samaras 2-4 cm long; 2 united basally each with 1 seed (Moss, 1983); reddish when mature; long stalk; widely spread pair (Nesom, 2006).
Phenology
Flowers April-June; fruits August-Sept/Oct. (Nesom, 2006).
Notes
Regeneration tied to fire (Nesom, 2006).
Range/Distribution
Alberta: SW mountain range. CAN (BC); USA (MT, WA, WY, UT) (Canadensys).
Citation
Page Citation for Acer glabrum Torr.
Page Citation
"Species Details - Acer glabrum Torr., University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/1-5179/12-85854. Accessed 03 Feb. 2025.
Specimen Information
There are 40 specimens of this Species.
12552 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Castle River
Date Collected1944
39028 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, North Kootenay Mountain
Date Collected1971-07-16
12556 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Kananaskis Country, Peter Lougheed Provincial Park, King Creek
Date Collected1955-07-27
12558 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Waterton Lakes National Park
Date Collected1939-08-24
12557 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Pincher Creek
Date Collected1941-05-19
12553 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Carbondale River
Date Collected1944
61654 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Waterton Lakes National Park
Date Collected1930-07-19
79651 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Kananaskis Country, Peter Lougheed Provincial Park, King Creek
Date Collected1977-06-08
61653 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Waterton Lakes National Park
Date Collected1934-08-19
120490 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: United States, Massachusetts, Suffolk County, Boston, Arnold Arboretum of Harvard University
Date Collected1923-08
120491 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: United States, Massachusetts, Suffolk County, Boston, Arnold Arboretum of Harvard University
Date Collected1923-08
122582 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Waterton Lakes National Park, Waterton Lakes
Date Collected1946-05-24
125549 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Elkhorn Stock Ranch
Date Collected2007-08-17
125007 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Gap Lake
Date Collected1980-06-13
128469 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Waterton Lakes National Park
Date Collected1972-05-24
128757 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, British Columbia, Horseshoe Ridge
Date Collected1983-07-01
137939 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Setaspell Outpost
Date Collected2015-08-07
143433 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Grizzly Creek
Date Collected1980-07-05
142439 - Acer glabrum Torr.
University of Alberta Vascular Plant Herbarium
Common Namemountain maple
Place CollectedNorth America: Canada, Alberta, Castle Wildland Provincial Park, Mill Creek
Date Collected2018-06-21