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. 2021 Jul 26;12:617851. doi: 10.3389/fpls.2021.617851

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Copyright © 2021 Trunschke, Lunau, Pyke, Ren and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Variation of flower color seen through the eyes of humans (1–6), in ultraviolet (7–12) and seen through the eyes of bees (12–18) using false color photography illustrating potential causes of neglected variation in flower color and bias in choice of study system. For a description of color representation see legend of Figure 3. Illustrated species are by row from top to bottom: Anemone trullifolia var. holophylla (Ranunculaceae), Tibetia yunnanensis (Fabaceae), Roscoea schneideriana (Zingiberaceae), Pedicularis superba (Orobanchaceae), Anaphalis nepalensis (Asteraceae), Caltha palustris (Ranunculaceae).