From the U.S. Forest Service:

"Cypress is a large-sized, native, deciduous, conifer, frequently 100 to 120 feet (30-37 m) in height.  It is slow growing and very long-lived. Individual trees have been reported up to 1,200 years old in Georgia and South Carolina.  In the forest, bald cypress typically has a broad, irregular crown, often draped in curtains and streams of gray Spanish moss. The trunks of older trees are massive, tapering, and particularly when growing in swamps, buttressed at the base. The deciduous leaves are linear and flat with blades mostly spreading, fastened alternately around the twig. Cypress is monoecious with its male and female flowers forming slender tassel-like structures near the edge of the branchlets. The bark of cypress is usually quite thin and fibrous with an interwoven pattern of narrow flat ridges and narrow furrows.  Cypress develops a taproot as well as horizontal roots that lie just below the surface and extend 20 to 50 feet (6-15 m) before bending down.

Knees: Cypress knees are a unique polymorphic structure of cypress trees. They start out as small swellings on the upper surface of a horizontal root and then protrude above the mud and water providing extra needed support. They vary in height from 1 to 12 feet (0.3-3.7 m) depending on the level of the water."

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