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. 2020 Jan 6;33(1):21–34. doi: 10.1007/s00497-019-00382-9

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Longitudinal sections of female flower meristem showing the development of female flower in Plukenetia volubilis under a light microscopy. a The floral meristem initiation at stage 2. b The sepal primordia initiation at stage 3. c The cube-shaped carpel primordia initiation at stage 4. d The carpel primordia united with its enclosed central cavity forms the pistil primordium at stage 5. e The locules formation at stage 6. f A complete pistil development at stage 8. Abbreviations: FA, floral apex; B, bracteole; S, sepal primordium; Ca, carpel primordium; Pl, Placenta; O, Ovule; Sty, Style; Sti, Stigma. Scale bars: (a–c) = 20 µm; (d, e) = 50 µm; f = 100 µm