This name is a synonym of Ocimum obovatum E.Mey. ex Benth..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 454075) with original publication details: Fl. Trop. Afr. 5: 346 1900.
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 knyanum in version 1 of The Plant List.