Karl Marx | Anton Chekhov | Anton Corbijn | Karl Pilkington | Karl Lagerfeld | Anton Bruckner | Anton Webern | Karl G. Heider | Karl Rove | Karl Pearson | Karl May | Karl Liebknecht | Karl Friedrich Schinkel | Karl Dönitz | Karl Jenkins | Karl Stefanovic | Karl Bodmer | Anton Reichenow | Karl Wilhelm Friedrich Schlegel | Karl Malone | Eugen Goldstein | Robert Anton Wilson | Karl Wolf | Karl Valentin | Karl Popper | Karl Malden | Karl Kesel | Karl Barth | Eugen d'Albert | Anton LaVey |
Among his many contributions to taxonomy are his treatments of the Medusagynaceae, Theaceae, Violaceae, and Canellaceae for the second edition of the Die Natürlichen Pflanzenfamilien of Engler & K. Prantl, the publication as editor with E. Werdermann, of ed.