There are two main species native to the southeastern U.S.: Magnolia grandiflora (Southern Magnolia) and Magnolia virginiana (Sweet Bay Magnolia).
“Little Gem” is a compact variety that grows narrow and upright to 25 feet in height. Leaves are glossy green and white flowers appear several times during the warm months.
The distinctive magnolia D. D. Blanchard grows to 40 feet. Growth habit is pyramidal (almost columnar). Leaves are large, long, and shiny green with deep bronze coloring beneath. White flowers are produced during the summer months.