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. 2017 Apr 18;8:558. doi: 10.3389/fpls.2017.00558

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Copyright © 2017 Hsu, Wang, Liang, Wang and Kuo.

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) or licensor 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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Boxplot of the Hausdorff distances between the petal sets. The letters A, B, and C indicate the groups of the petals. The Roman numerals indicate the comparison of two-petal set pairs, (I) the dorsal and ventral petals of actinomorphic plants, (II) the dorsal and ventral petals of zygomorphic plants, (III) the ventral petals of actinomorphic and zygomorphic plants, (IV) the dorsal petals of actinomorphic and zygomorphic plants, (V) the dorsal petals of actinomorphic plants and the ventral petals of zygomorphic plants, and (VI) the ventral petals of actinomorphic plants and the dorsal petals of zygomorphic plants.