The record derives from TICA
(data supplied on )
which reports it as a synonym (record
8072AC86-9AB3-47F5-AA2C-DEBF4F9613BF) with original publication details: "F.J. Ruprecht - in Ost.-Sack. & Rupr., Sert. Tianschan.. 1869" 59 1869.
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 pygmaea in version 1 of The Plant List.