Acknowledgements

We sincerely thank the following persons and institutions for their great help and support:

•	The Klaus Tschira Foundation gGmbH for funding the Project and Christof Nikolaus Schrder for his work in his function as project coordinator until 2016.
•	Prof. Wilhelm Barthlott (Nees-Institut für Biodiversität der Pflanzen, University Bonn) for generously providing us with Werner Rauh's original fieldbooks.
•	The Heidelberg Academy of Sciences and Humanities for providing technical help making their ImageWare Components Bookeye scanning system available for us. Without this the fieldbooks would not have been scanned in such a quality.
•	Urs Eggli (Sukkulentensammlung Zürich) for a very fruitful and helpful discussion on the project's data model.
•	Missouri Botanical Garden for permission and technical support to download taxonomical data from Tropicos.org to our database.
•	Sven Bernhard, Fritz Brand, Monika Bruggaier, Jean-Philippe Castillon (Universit de la Runion), Ludwig Daum, Jörg Ettelt (FGaS), Matthias Finger, International Organization for Succulent Plant Studies, Ingrid Jordon-Thaden (COS Heidelberg), Katja Joswig, Sven Keul, Christina Marie Kimmel-Schröder, Jürgen Müller (Herbarium Haussknecht Jena, JE), Christian Niesel, Nicolai M. Nürk (COS Heidelberg), Deutsche Orchideengesellschaft e.V., Renata Sterzik, Timm Stolten, Mike Thiv (Staatliches Museum fr Naturkunde Stuttgart, STU), Sina Weißbach.

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