A remarkable aspen forest that sprouted from a single seedling makes "the Roman Empire seem like a recent phenomenon." ...

Aspen has distinctive, almost-circular leaves with flattened petioles or stems. This flattening causes the leaves to tremble or flutter in the slightest breeze, thereby giving the tree one of its most ...

This flattening causes the leaves to tremble or flutter in the slightest breeze, thereby giving the tree one of its most obvious distinguishing characteristics. Another feature of aspen leaves is ...