Bald Cypress (Taxodium distichum)

Bald cypress trees are common in areas of shallow water in the southeastern United States. They tend to grow in clusters in swamps and along the shores of rivers. Cypresses grow to 21 m (70 ft), and have a broad canopy of fine leaves.

Cypress trees are easy to identify because of their "knees" (see picture). Cypress trees have woody growths, called "knees," surrounding them. Knees are extensions of the cypress tree. They grow up from the tree's roots. Knees may grow to about a meter (3 feet) in height. The function of these knees is not exactly known. One idea is that the knees help the tree absorb oxygen from the air. This would be useful for the tree because the base of the tree is usually under water. Another idea is that knees help anchor the tree to the ground when it is windy. This would be useful for the tree because the soil surrounding the tree is usually very wet and loose.

The wood of cypress trees is valuable because it resists rotting. Special chemicals in the wood prevent fungi from breaking down the wood and causing it to rot. Cypress wood, therefore, is used for building things that may get wet. These include roof shingles, house siding, outdoor benches, and caskets.