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. 2021 Feb 19;11:4246. doi: 10.1038/s41598-021-81781-9

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© The Author(s) 2021

Open Access This 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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Bisexual flowers and reversion to bisexuality in castor. Bisexual flowers with (A–D) Rudimentary stamens (E–H) Equally developed carpel and stamens and (I–L) Rudimentary pistil. (M–Q) Reversion to bisexuality in female flowers at (M) stage 6 (N,O) stage 11 and (P,Q) stage 12. (R–U) Origin of rudimentary stamens. (V) Section of flower showing origin of rudimentary stamens. (W) Larger anthers in rudimentary stamens. Arrows indicate stamen primordia or rudimentary stamens (B,C,M–V) or rudimentary pistils (J–L). Scale bars are shown below.