Is that tree a pine, a fir or a spruce? Here's a handy guide to identifying the many species of trees populating Central ...

Ponderosa pine trees dominate parts of Eastern Oregon and Washington and have long been an icon of the American West, but in the past decade more than 200 million ponderosa have died. Particularly in ...

A mountain chickadee peers down from its perch in a ponderosa pine. Click here for larger image. Photo by Jeff Mitton. As the most recent glaciers subsided, ponderosa pines move north from their ...

While reading a Sierra Nevada natural history book, we learned about a rare patch of Washoe pines (Pinus ponderosa var. washoensis) that exist in our Reno area. Eager to see these rare trees in person ...

This is a preview. Log in through your library . Abstract Differential utilization of a limiting resource has been hypothesized as the mechanism through which ponderosa and sugar pine are maintained ...