(Rubiaceae), a new species from Northern Mexico.

The new species Lorence & T.Van Devender from Sinaloa and Sonora, Mexico differs from its congeners by its larger, showy white flowers in compact cymes of 3-9, and infundibuliform corollas 16-20 mm long with tubes 13-17 mm long and lobes 3-3.5 mm long.