The record derives from TICA
(data supplied on )
which reports it as a synonym (record
534C5AC8-0302-4964-89D5-BEC13DC54137) with original publication details: Babc. & Stebbins in Publ. Carnegie Inst. Wash. 484. 1937 48 1937.
This name record (from TICA) 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 Youngia tenuifolia in version 1 of The Plant List.