Well, actually just one tree, in a nice desert shadow, probably a piñon tree.
A mini-tree meme is going around the GeoBlogosphere - started here by Geotripper, and followed on with here at Clastic Detritus. I've had a couple posts recently showing some trees, but I don't really have a favorite tree, unless it would be one in those previous posts, a tall aspen tree in our backyard.
I picked the above tree photo, because it was the shadows in the Basin and Range of Nevada that made me realize a long time ago that I loved the place.
UPDATE: More trees are sprouting here and there. Geotripper is keeping track of them - be sure to check them all out.
UPDATE AGAIN: More sprouting going on all over the place, and here, too! Many posts mention some link between trees and geology. And another one!