This name is a synonym of Thymelaea villosa (L.) Endl..
The record derives from WCSP (in review)
(data supplied on 2012-03-26)
which reports it as a synonym with original publication details: Kongl. Vetensk. Acad. Handl. 1818: 332 1818.
This name record (from WCSP (in review)) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Passerina villosa in version 1 of The Plant List.