Metopium brownei, commonly known as Black Poisonwood, is a species of flowering plant in the cashew family, Anacardiaceae. This tree is recognized for its distinctive appearance and its potent urushiol-containing sap, which can cause severe skin irritation upon contact. It holds ecological significance within its native range and is a notable component of tropical and subtropical ecosystems. The growth habit of Metopium brownei is that of a tree, typically reaching heights of 10 to 20 meters, though it can occasionally grow taller. Its canopy is often dense and rounded. The leaves are pinnately compound, meaning they consist of multiple leaflets arranged along a central stem. Each leaflet is ovate to elliptic in shape, with an entire or slightly crenulate margin, and measures approximately 5 to 10 centimeters in length. The adaxial (upper) surface of the leaflets is typically glossy and dark green, while the abaxial (lower) surface may be paler. The bark of mature trees is dark gray to black, often fissured, contributing to the common name "Black Poisonwood." The flowers are small and inconspicuous, borne in panicles. They are typically greenish-yellow and appear during the warmer months. Following flowering, the plant produces small, drupaceous fruits, which are ovoid and turn from green to a dark purplish-black when ripe. These fruits are a food source for some wildlife. Metopium brownei is native to the southeastern United States, specifically southern Florida and the Florida Keys, as well as the Caribbean, including Cuba, the Bahamas, and the Cayman Islands. It thrives in coastal habitats, often found in rocky coastal hammocks, mangrove fringes, and disturbed areas. It prefers well-drained soils and can tolerate saline conditions. While it is adapted to warm climates and is sensitive to frost, it can be cultivated in USDA hardiness zones 10b through 11. The primary notable characteristic of Metopium brownei is its allergenic sap, which contains urushiol, the same irritant found in poison ivy and poison oak. Contact with any part of the plant, including the sap, leaves, bark, or even smoke from burning wood, can cause a severe dermatitis reaction in sensitive individuals. This property makes it a plant to be handled with extreme caution. Ecologically, it plays a role in its native environment, providing habitat and food for certain fauna. Its wood, though difficult to work with due to its toxicity, has been used traditionally for various purposes where its durability was valued, though this is less common now due to safety concerns. There are no widely established medicinal, culinary, or agricultural uses for this species due to its toxic nature. An interesting adaptation of Metopium brownei is its ability to thrive in challenging coastal environments, tolerating salt spray and often poor, rocky soils. The dark, fissured bark provides a distinctive visual characteristic, and the glossy green foliage adds to its tropical aesthetic, though its allergenic properties necessitate careful consideration for any ornamental planting.