We thank the technical workshop of the University of Freiburg (Biological Institutes II/III) for constructing the technical devices, the team of the Botanical Garden of Freiburg for providing plant material, Rainer Oberle, and Hans and Johanna Bumbel for granting access to plants in private gardens, and Randy Cassada for improving the readability of this text. The Deutsche Forschungsgemeinschaft (SPP 1127) is gratefully acknowledged for financial support (Cl 81/9-1, Sp 534/5-1 and 5-2).

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