Acer glabrum “Rocky Mountain Maple” Aceraceae

Apgar Lookout Trail, Glacier National Park, MT
October 9, 2015
Robert Niese

Montana is home to two species of maple, but this is our only native. The Rocky Mountain Maple can be found in moist, open forests, avalanche slopes, and riparian areas throughout the Pacific Northwest, but is most common east of the Cascades. In the west, A. glabrum could be confused with A. circinatum, the Vine Maple, which tends to be much more common. However, simple differences in their leaf shape, fruit color, and fruit shape make the distinction quite straightforward. Like all maples, these plants have neat, aerially dispersed seeds called samaras that spin like a helicopter blade as they fall to the ground. During World War II these seeds inspired parachute-less cargo containers that could be dropped from planes to provide emergency supplies or mail to inaccessible locations.

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