Yes green as in freshly cut not dried wood. Green wood will steam bend much better than dried wood. Even with this fresh wood I will soak it in water for about three days before bending the cores.
I don't know where exactly it was growing but as long as the wood is perfectly straight, no twist, no pins etc it doesn't really matter. Young trees are more elastic and easier to bend but if older trees are all you can get it shouldn't make much difference in the finished bow.
Aaron - it is mountain maple. Yes it has been a long search!! I think I've found a good supplier now he is a tree surgeon and knows what to keep from the burnpile! I've finally managed to germinate some Tatarian maple seeds but they will be a few years yet....
I'm going to make a couple of Turkish flight bows, one about 60# and one about 100#. A Turkish warbow with dimensions from one of the old bows in the Topaki museum to see what weight they were shooting back in the day. I've got a hankering to try a Korean bow and a Crimean Tartar style as well.
I'll be busy for a while