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. 2017 Oct 6;8:1665. doi: 10.3389/fpls.2017.01665

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Copyright © 2017 Naghiloo and Claßen-Bockhoff.

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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Flower development in Knautia arvensis (a–i) and Scabiosa ochroleuca (j–r). Adaxial side is toward the top in (b–e,l–o). (a) Appearance of epicalyx and corolla ring (arrows). (b–e) Initiation of petals and stamens. (f) Formation of calyx ring higher than epicalyx. (g) Enlargement of petals. (h) Appearance of carpel ring meristem. (i) Development of calyx as small hairy bristles. (j–r) The same developmental stages in S. ochroleuca. Not the early initiation of sepals in (j,k), and development of enlarged bristles in (r). Abbreviations: abP, abaxial petal; C, carpel; E, epicalyx; O, ovary; P, petal; S, stamen; Se, sepal. Same scale for (a–d), (e–g), and (j–o).