Friedrich Karl Max Vierhapper (7 March 1876 in Weidenau – 11 July 1932) was an Austrian plant collector, botanist and professor of botany at the University of Vienna.
From 1894 to 1899, he studied natural sciences at the University of Vienna, where he later worked as an assistant to Richard Wettstein at the botanical institute.
In the meantime, from 1918 he was employed as an associate professor of systematic botany at the University of Vienna.
[3] He processed and described flora collected from an expedition by the Vienna Academy of Sciences to southern Arabia and Socotra (1898–99).
[6] In 1929 he published the second edition of Anton Kerner von Marilaun's Das Pflanzenleben der Donauländer (The plant life of Danube countries).