The leaves are circular or triangular ... around 2.6 million years ago. The aspen tree is found in Canada, northwestern Alaska, and southeast through Yukon and British Columbia.

Thin aspen leaves rustling in the crisp Colorado air ... At left is a typical warm weather leaf from a southern live oak tree. At right is a leaf more typical of cooler weather, from a sweetgum ...

One tree does not make a forest, but a lone tree can nevertheless function as a small-scale ecosystem. Considering all the ...

This wound leaves open the possibility of diseases or pests entering the tree,” the Leave No Trace website said. Aspen trees are particularly vulnerable because they are linked together ...

It was an aspen tree, not one yet showing off the shiny leaves we seek this time of year. Maybe they would never show. “I saw the orange hue on the bark,” said Korb, who has researched the ...

The Ely Echo weekly newspaper and its companion pieces - North Country SAVER and North Country ANGLER - provide insight into ...

A quaking aspen tree, Pando aspen, in Fishlake National Forest ... In the mid-1970s he walked through it and compared leaves on neighboring trees, using them to distinguish between stems ...

Aspen has distinctive, almost-circular leaves with flattened petioles or stems. This flattening causes the leaves to tremble or flutter in the slightest breeze, thereby giving the tree one of its ...

Beyond the aspen In Colorado ... Bicyclists pedal past an elm tree whose leaves are beginning to experience autumn changes in Washington Park in 2003. (Cyrus McCrimmon, The Denver Post ...