This rare Caribbean tree is Cóbana Negra, Libidibia monosperma. Older references and some conservation records may still list it as Stahlia monosperma, but Libidibia monosperma is now the accepted botanical name. It belongs to the legume family, Fabaceae, and is native only to Puerto Rico and the Dominican Republic.

Cóbana Negra is an evergreen tree that may grow roughly 23 to 50 feet tall. It usually develops a rounded crown and a straight trunk, although its shape depends greatly on the conditions in which it grows.

The leaves are compound, with six to twelve oval or lance-shaped leaflets arranged along a reddish central stalk. If you look closely at the undersides, you may see tiny dark glands that resemble black dots. These are useful identifying features.

The flowers are small and pale yellow. They are not especially dramatic individually, but they may appear in clusters and attract bees and other insects. In Puerto Rico, flowering is often recorded between March and May, depending on rainfall.

After flowering, the tree produces short, somewhat fleshy pods. As they mature, the fruits turn a striking bright red and may develop a fragrance resembling ripe apples. Each fruit normally contains only one seed, which explains the species name monosperma, meaning “one-seeded.”

Its wood is extremely hard, dense and durable, with dark brown heartwood and lighter sapwood. It was historically valued for construction and woodworking, but harvesting and habitat loss contributed to the decline of the species.

Cóbana Negra is federally listed as threatened in the United States. Its remaining natural populations are found mainly in Puerto Rico, including Vieques, with additional populations in the Dominican Republic. Conservation work includes collecting seed, propagating young trees and planting them in protected areas.

In the wild, it is often associated with coastal wetlands, streams, mangrove margins and the edges of shallow brackish lagoons, although some trees grow on slightly higher and drier ground.

This is therefore much more than an attractive Caribbean tree. Its compound leaves, red one-seeded fruits and valuable hardwood are all interesting, but its rarity is what makes it especially important.

When we stand beside a Cóbana Negra in a botanical garden, we are looking at a living conservation specimen—a representative of a tree whose entire natural range is limited to just two Caribbean islands.