I am pretty sure that had I seen the quiver trees they would have been my favorite, but I only saw them in South Africa and even them they were fairly small since it wasn't there "prime territory". But I think the quiver trees are in southern Namibia only....In a way I am please that they are not my favorite because they are so obvious...If you know what I mean.
Here is a spot where you can read some interesting stuff about the mopane tree:
http://www.plantzafrica.com/plantcd/colomopane.htm
I tell you it is a lot easier to find information on a plant/tree when you know its name!!
Here are two photos from the site. I have some leaves pressed in the book I was reading at the time. I'll take photos and you will understand better why this tree is my favorite.
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I'm sure hoping that saying where you get the photo from is the way to handle copywrited stuff!