What is "nyssa aquatica"

Water tupelo \Wa"ter tu"pe*lo\ (Bot.) A species of large tupelo ( Nyssa aquatica) growing in swamps in the southern of the United States. See Ogeechee lime.

Nyssa aquatica, commonly called the water tupelo, cottongum, wild olive, large tupelo, sourgum, tupelo-gum, or water-gum, is a large, long-lived tree in the tupelo genus (Nyssa) that grows in swamps and floodplains in the Southeastern United States.

Nyssa aquatica trunks have a swollen base that tapers up to a long, clear bole, and its root system is periodically under water. Water tupelo trees often occurs in pure stands.