Hintonia pulchra D.R.Simpson Osa pulchra is a species of rare flowering plant in the monotypic genus Osa, belonging to the family Rubiaceae.

[4] The genus name is derived from that of the Osa Peninsula in southwestern Costa Rica.

Osa pulchra has large white, trumpet-shaped, pendulous flowers reminiscent of those of certain Solanaceous genera - particularly those of Brugmansia and Solandra.

The blooms are highly fragrant at night and are most likely pollinated by bats (chiropterophily).

It needs a warm and humid climate with a well drained substrate and bright, indirect light.