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. 2019 Feb 27;7:e6329. doi: 10.7717/peerj.6329

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©2019 Pamminger et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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The graph depicts the nectar sugar concentration of 52 sunflower varieties (Helianthus annuus) grown at two geographic locations in Bulgaria (Toschevow and Plovdiv area) between 1981 and 1986. Data taken and re analyzed from Simidtschiev (1988). Results of the statistical analysis (paired Wilcoxon test, V and p values) are presented in the lower left corner.