Conocarpus erectus is usually a dense multiple-trunked
shrub, tall, but can grow into a tree up to or more tall, with a trunk up to in diameter. The United States National Champion green buttonwood is tall, has a spread of , and a circumference of . The bark is thick and has broad plates of thin scales which are gray to brown. The twigs are brittle, and angled or narrowly winged in cross-section. The
leaves are alternately arranged, simple and oblong, long (rarely to long) and broad, with a tapering tip and an entire margin. They are dark green and shiny on top, and paler with fine silky hairs underneath, and have two salt glands at the base of each leaf. The fruits are
button-like (from which the common names derive), diameter, with no petals; they are produced in stalked
panicles of 35-56 flowers. The
fruit is a cluster of red to brown, small scaly, two-winged
cone-like
seeds, long. The seed heads burst when ripe, and the seeds are dispersed by water. ==Uses==