A revision of Gibsoniothamnus L. O. Williams (Schlegeliaceae)

Gibsoniothamnus L. O. Williams is a genus of 11 species native to Mexico, Central America, and northern Colombia. The species are shrubs or small trees with opposite, entire leaves, tubular corollas, four stamens, 2-locular ovary, and fleshy, indehiscent fruits. Calyces are unlobed, or they may have lateral, triangular or winglike lobes. Most species are epiphytes and appear to be bird pollinated and bird dispersed.