"John Jonston (in Polish, Jan Jonston; in Latin, Joannes Jonstonus; Szamotuły, 15 September 1603 – 1675, Legnica) was a Polish scholar and physician, descended from Scottish ...
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nobility and closely associated with the Polish magnate Leszczyński family. The standard author abbreviation Jonst. is used to indicate this person as the author when citing a botanical name." - (en.wikipedia.org 15.02.2022)