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Can a conifer offer fall color? Consider the Alpine larch in the northern Rocky Mountains


Subalpine larch is one of the last trees to be found before entering an alpine ecosystem. This landscape is dominated by subalpine larch on Temple Ridge with Prusik Peak in the background on the Okanogan-Wenatchee National Forest.

Subalpine larch is one of the last trees to be found before entering an alpine
ecosystem. This landscape is dominated by subalpine larch on Temple Ridge
with Prusik Peak in the background on the Okanogan-Wenatchee National Forest.
Photo credit: Courtesy Laura Potash

Posted by: Steve Shelly, Regional Botanist, US Forest Service Northern Region


Do you think that all conifers are always evergreen? While most of them are,the forested landscapes of the northern Rocky Mountains offer an amazing colorful exception to this each fall with the spectacular shows of the Subalpine larch (Larix lyallii).


The Rockies are generally dominated by evergreen conifers – trees that bear cones and keep their needles all year long – so in many areas these landscapes don’t put on quite the displays of color in autumn like those of the eastern forests. Yet, consider this amazing exception. Early each fall, at elevations above 7,000 feet or so in western Montana, the subalpine larch conifer tells its unique deciduous story.


Each October, as the mountain air cools and the first snows dust the top of the peaks, their needles turn a brilliant, yellow-orange color before falling off. In Missoula, Mont., this beautiful coloration can even be seen from the center of town, as one gazes southwest to the Bitterroot Mountains. A brightly colored “cap” can be seen on top of Carlton Ridge, where a large stand of subalpine larch puts on a full display – this shining ribbon of trees can be seen from nearly 20 miles away!

 

The fall color of a subalpine larch set against a backdrop of a beautiful blue sky and Mt.. Stewart,on the Cle Elum Ranger District, Okanogan-Wenatchee National Forest.

The fall color of a subalpine larch set against a backdrop
of a beautiful blue sky and Mt.. Stewart,on the Cle Elum
Ranger District, Okanogan-Wenatchee National Forest.
Photo credit: Courtesy of Dawn Fouts

These hardy trees live in high, cold places where lots of snow falls each year. In many areas, they are the highest-elevation trees in the Rockies. Every year, these stands are also hit more than once by hurricane-force winds. But still they persist, adding a blast of color to the higher mountains right before the first deep snows come. While you can see the colorful display from a distance, the best way to really appreciate these forests is to hike through them just as their color is peaking. A walk through a changing subalpine larch stand is unlike any other this time of year. It’s as if the whole world lights up - even the air itself seems to turn a golden color.

 

US Forest Service
Last modified September 03, 2013
http://www.fs.fed.us

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