"German biologist" . "Markgraf, Friedrich"@en . "1987-03-08Z"^^ . "1897Z"^^ . "1897-02-01Z"^^ . "Friedrich Markgraf (1 February 1897 in Berlin-Friedenau \u2013 8 March 1987) was a German botanist."@en . "1987Z"^^ .