Werdermann traveled to Madrid to see the collections of Hipólito Ruiz López and José Antonio Pavón Jiménez.
Erich von Stroheim | Erich Ludendorff | Erich Fromm | Erich Maria Remarque | Erich Leinsdorf | Erich von Däniken | Erich Kästner | Erich Mendelsohn | Erich Honecker | Erich Segal | Erich von Manstein | Erich von Falkenhayn | Erich Mielke | Rudolf Erich Raspe | German destroyer Z13 Erich Koellner | Erich von Drygalski | Erich Thomas | Erich Kunzel | Erich Fried | Erich Cohn | The Music of Erich Zann | Otto Erich Deutsch | Kevin Von Erich | Hans Erich Slany | German destroyer Z12 Erich Giese | Fritz Von Erich | Erich Zepler | Erich Raeder | Erich Priebke | Erich Pommer |
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.