This name is a synonym of Enicostema verticillatum (L.) Engl..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50247994) with original publication details: Fl. Tellur. 3: 27 1836.
This name was in version 1 of The Plant List, record tro-50247994.