Acknowledgements
The authors would like to thank Sue Zmarzty (K) for the many constructive discussions regarding character coding, Wolfgang Stuppy (K) for clarification of seed character states, Hans-Joachim Esser for his input into "Genera Euphorbiacearum" and this key in tribe Hippomaneae, Kenneth J. Wurdack (US) for pointing out some additional useful characters, and Hashendra Kathriarachchi (Colomba University, Sri Lanka) and Maria Vorontsova (K) for testing the key.