Joseph Gaertner ( March 12 1732 -- July 14 1791 ) was a German botanist , best known for his work on seeds , '' De Fructibus et Seminibus Plantarum '' ( 1788 - 1792 ) .
Joseph Gaertner ( March 12 , 1732 , Calw - July 14 , 1791 , Tübingen ; in German Joseph Gärtner ) was a German botanist . 
 His major publication is '' De Fructibus et Seminibus Plantarum '' ( 1788 - 1792 ) .