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. 2017 Aug 10;31(6):899–912. doi: 10.1007/s10682-017-9916-1

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Examples of different types of visual nectar guides. a Limnathes douglasii, demonstrating straight, thin nectar guides and centre with a contrasting colour; b Jovellana punctate, demonstrating a non-radiating speckled guide; c Cistus ladanifer, demonstrating peripheral dots of contrasting colour; d Schizanthus wisetonensis, demonstrating speckled flowers with a radiating arrangement. Photo credits: a. David Lawson; b. Pabloendemico; c. Carsten Niehaus; d. Hans Braxmeier. See image references for full details