This name is a synonym of Platostoma tenellum (Benth.) A.J.Paton & Hedge.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 454077) with original publication details: Bull. Herb. Boissier 2: 120 1894.
This name record (from WCSP) 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 Ocimum tenellum in version 1 of The Plant List.