NatureServe is an environmental web site whose mission is: " to provide the scientific basis for effective conservation action." The is the first Environmental organizations I have added to my list at the bottom of my blog for a while.
Environment has an article on the cost of losing diversity in the environment.
This blog was mentioned in "The Festival of Trees" hosted by Via Negativa. I submitted my posts on Black oak. There are also interesting photos of Bald cypress. My Bald cypress photos were taken outside of its range, but these old growth trees are amazing.
Osage+Orange blog had a nice article on Osage orange.