When most people think of seeing ... see around the city are all from trees other than aspens. Dan Johnson, the associate director of horticulture at the Denver Botanic Gardens, says that nearly ...

The seeds then drop from trees as acorns, nuts, samaras, drupes, and pods. The most common North American tree is considered to be the red alder. It has oval-shaped leaves and reddish-brown bark.

Sugar maples normally grow 80-110 feet in height, but trees as tall as 150 feet have ... The boxelder (Acer negundo) is the most common maple species in mid-western North America, and the only ...