This name is a synonym of Tragopogon pratensis subsp. minor (Mill.) Hartm..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 18A72344-0866-4D66-8B22-93BCAC5A4FC8) with original publication details: "Wimm., Fl. Schles.. 1832" 195 1832.
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 Tragopogon micranthes in version 1 of The Plant List.