Appearance''C. erectus'' is usually a dense multiple-trunked shrub, 1–4 m tall, but can grow into a tree up to 20 m or more tall, with a trunk up to 1 m in diameter. The United States National Champion green buttonwood is 35 ft tall, has a spread of 70 ft , and a circumference of 207 in . 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, 2–7 cm long and 1–3 cm 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 , 5–8 mm 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, 5–15 mm long. The seed heads burst when ripe, and the seeds are dispersed by water.
It is generally found growing in brackish water in tidal lagoons and bays, but can grow in inland habitats, with records at up to 745 m altitude in Costa Rica.
Naming''Conocarpus erectus'' is known by a variety of other names in various localities, including Asokolo, Asopolo, Botoncahui, Botoncillo, Botonillo, Chene Guadeloupe, Conocarpe Droit, Estachahuite, Geli, Gra Mangrove, Grignon, Grijze Mangle, Grijze Mangrove, Iztac-cuahuitl, Jele, Kaba, Kan-chik-inche, Kanche, Kank-ank-che, Kank-che, Madre de Sal, Mangel, Mangel Blancu, Mangle, Mangle Blanco, Mangle Boton, Mangle Botoncillo, Mangle Cenizo, Mangle Garbancillo, Mangle Gris, Mangle Jeli, Mangle Lloroso, Mangle Marequita, Mangle Negro, Mangle Pinuelo, Mangle Prieto, Mangle Roche, Mangle Torcido, Mangle Zaragoza, Manglier, Manglier Gris, Mangrovia Grigia, Mangue, Mangue Branco, Mangue de Botao, Maraquito, N Ja, Paletuvier, Paletuvier Gris, Pash-chuhnul, Pataban, Saragosa, Taabche, Tabche, Witte Mangel, Witte Mangro, Wortelboom, X-kanche, Xtabche, Yana and Zaragosa.
UsesThe tree is used as an ornamental plant and in bonsai. The variety ''sericeus'', with silvery leaves, is especially prized for landscaping. It is an important host plant for epiphytes. As a result of ornamental planting, it has become naturalized in Hawaii. It has been used extensively in landscaping in Kuwait and became the most abundant tree/shrub. Conocarpus is widely believed to be fodder for the African buffalo, and it is understood that this is the source of their acidic urine.
The wood is sometimes used in cabinets; it is difficult to work but takes a smooth finish. It is also used as firewood, and is reported to be good for smoking meat and fish, as it burns very hot and slowly; it also makes high quality charcoal. The bark is high in tannin, for which it has been harvested commercially.
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