Enterolobium cyclocarpum (Monkey Ear)

Enterolobium cyclocarpum, commonly known as Guanacaste, Ear Tree, or Elephant Ear Tree, is a large, fast-growing deciduous tree in the Fabaceae family, native from Mexico through Central America to northern South America. It is characteristic of seasonally dry tropical forests, savannas, and open woodlands. Mature trees may reach 80-100 feet tall, developing massive trunks and exceptionally broad, spreading crowns. The finely divided, bipinnate leaves fold at night. Small, greenish-white flowers are borne in rounded heads, followed by distinctive thick, dark brown, ear-shaped pods that curl into almost complete circles. These woody, indehiscent pods contain hard seeds embedded in sweetish pulp and give the species its name, cyclocarpum, meaning "circular-fruited."

Enterolobium cyclocarpum thrives in full sun and warm tropical climates, tolerating seasonal drought once established. It adapts to a range of soils, including alkaline and moderately acidic conditions, but needs ample space for its extensive crown and roots. Best suited to USDA Zones 10-11, it is sensitive to prolonged frost. The tree is valued for shade, timber, and agroforestry. Its pods are used as livestock feed in some regions, although excessive consumption can cause poisoning, particularly in cattle.