Trees need leaves primarily because of photosynthesis and respiration. Photosynthesis is the process by which carbon dioxide is converted into nutrients that are needed by plants for survival. More »

Trees such as oaks and maples can be identified by the shapes of their leaves. Maple leaves are usually lobed and palmate, which means the midribs of the lobes radiate out from a single point. More » Science Biology Botany

Coniferous trees that are evergreen keep their leaves to preserve water during the winter and through droughts. Many coniferous trees are found where the winters are cold and the ground freezes. Once the ground is frozen... More » Home & Garden Gardening & Landscapes Trees & Bushes

Trees grow as a result of the formation and division of cells in meristems and by conducting photosynthesis and absorbing nutrients and water through their root systems. Cells in the cambium layer divide and grow to form... More » Home & Garden Gardening & Landscapes Trees & Bushes

Willow trees can be differentiated by their leaves, their form, their bark and their catkins. Willows are mostly deciduous trees, which means they lose their leaves in the fall. Male and female flowers are found on diffe... More »

According to, palmettos are dwarf palm trees that have fan-like leaves and are common in the Southeastern United States. Most palm trees that are considered palmettos fall into the genus Sabal, and the name... More »

To identify oak trees using leaves, examine the leaf branching on the corresponding tree, determine if the leaf is simple or compound, and look for lobes on the leaf's edge. Also, check to see whether the lobes are point... More »