⚠ Version 1 of The Plant List has been superseded.
This name record (from WCSP (in review)) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Arrhostoxylum costatum in version 1.1 of The Plant List.
This name is a synonym of Ruellia costata .
The record derives from WCSP (in review) which reports it as a synonym with original publication details: Fl. Bras. 9: 61 1847.