http://treebrowser.org/index.cfm?controller=final&action=details&key=450&sortby=CommonNameWhichever tree the pics of the leaves came from is tamarack/larch. The leave grow almost directly off the stem. The leaves will yellow and fall in the winter giving the appearance that it's dead. Look like there's another specie in there which appears to be white or grand fir.
Larch is very good wood. White fir has about 30 minutes between seasoned and rotten. Keep it out of the weather and it will dry just fine and be ready for use by next season. 1 step up from balsa wood but hey, it's free.