Redwood trees have two types of leaves, one to make food and the other to absorb water, found a new study. It's the first study to estimate whole-crown water absorption in a large, mature tree. The ...

It's a Treehugger's dream come true. Leafsnap is a free app that identifies plant species of all kinds, from flowers and bark to fruit and trees. Go for a walk, take a shot of a leaf, and this little ...