The aspen tree (Populus tremuloides) is the most widely distributed tree species in North America, ranging from Alaska to Newfoundland and down the Rocky Mountains to Mexico. Utah and Colorado ...

Under the scrutiny of a black-robed official and before a hushed audience, a decorative cookie tin rattles like a bingo drum.

Elm trees have leaves that are doubly toothed around the margins and are usually asymmetrical at the base. They grow in an alternating pattern along the stem. Some elm leaves are smooth on one ...