The reason you don't find capsulized info like the sites you have posted is that North America is a vast place with a huge variety of climate zones and native species. A single web page can't cover it.
The best place to start for North American bonsai is the American Bonsai Society:
http://www.absbonsai.org/
Try the links section.. The magazine the group produces (ABS Journal) has has articles and photos of a host of North American native species as bonsai, collection, etc. It's a must have. The organization has a long history of helping North American bonsaiists.