This is an oak tree growing on the side of Hwy 70 in Northern CA. There are many fine specimens growing along that route that I can see off in the distance. But all I had to do was pull off to the side for this one and wait till traffic was clear to get this picture.

This is a cottonwood growing on Beale AFB CA. Although I don't plan to grow any cottonwoods, this could be imitated by many other trees.

This is another oak tree growing off in the distance on a side road in Northern CA.

Another oak tree but this one has a nice full canopy instead of looking like it has fought for survival.

I have no idea what kind of tree this is. It sits off to the side of the building where I take my Tai Chi class. It has a nice multiple trunk though. I had to mess with the color contrast to make it visible but I think you get the picture.