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. 2020 Apr 27;10:7039. doi: 10.1038/s41598-020-63997-3

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Colour photo (left), UV-photo (middle), and false colour photo in bee view (right) of (a–c) disc nectary in Saxifraga melanocentra, (d–f) two glossy protuberances per petal in S. signata, (g–i) ring of glossy basal parts of petals in Anaphalis nepalensis, (j–l) glossy tips of staminodes in Parnassia wightiana, (m–o) dark, glossy petal base in Codonopsis graminifolia, and (p–r) glossy tips staminodes in Trollius yunnanensis. Arrows in the UV-photos indicate glossy areas. The photos were taken on Yulong Snow Mountain and Baima Snow Mountain in China (Yunnan).