A tree ID key that uses features of the tree to identify it??????
some examples:
What Tree Is It? HOME
Dendrology at Virginia Tech
What Tree Is That?: Tree Identification Field Guide from Arborday.org
There are a host of good books out there too.
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I see these things all over. Most of the deciduous trees are fully leafed out by now, most of which started in January-February. This guy is still dormant. What is the ID on this? I am in Socal.