WoRMS source details
Bull. Int. Acad. Polon. Sci., Cl. Sci. Math., Ser. B, Sci. Nat. 1928
312160
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Hieracium pietroszense subsp. jarzabczynum Pawł. & Zahn accepted as Hieracium jarzabczynum (Pawł. & Zahn) Mráz & Chrtek f. (original description)