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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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The major shape variations of the dorsal petals. The PC1, PC2, and PC3 scores accounted for 45.6, 8.8, and 6.8% of the total shape variation of dorsal petals, respectively. Yellow dots represent landmarks. Red circles represent labeled landmarks. Cyan, green, and red lines represent the lobe contours, tube boundaries, and petal midribs, respectively. The petal forms with mean PC values are illustrated in gray; the petal forms with PC values of mean ± 2 standard deviations are illustrated in beige.