Cobana Negra

Stahlia monosperma (Tul.) Urban, Symb. Ant. 2: 285. 1900
Caesalpinia monosperma Tul. Arch. Mus. Paris 4: 14S. 1844. Stahlia maritima Bello, Anal. Soc. Esp. Hist. Nat. 10: 255. 1881.
A tree, up to 20 m. high, with glabrous twigs and leaves. Petioles 1-2.5 cm. long; leaflets 6-12, mostly opposite, short-stalked, 5-9 cm. long, ovate to ovate-lanceolate, entire or irregularly crenulate, shining above, dull beneath, acute or short-acuminate at the apex, truncate, obtuse or subcordate at the base; racemes 10-15 cm. long, the rachis, bracts, pedicels and calyx sparingly pilose; pedicels stout, recurved, 4-8 mm. long; sepals ovate, obtuse, about 6 mm. long; petals 10-12 mm. long; stamens deflexed, about as long as the petals; legume 5 cm. long or less, about 2.5 cm. wide and 1 cm. thick, purple, coriaceous, 1-seeded.
Type locality: Porto Rico. Distribution: Porto Rico; Vieques.

Libidibia monosperma is a species of legume in the family Fabaceae, with the common names cóbana negra and cóbana polisandro. It is found in the Dominican Republic, Puerto Rico, and the United States Virgin Islands. It is a federally listed threatened species of the United States.