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. 2018 Jul 30;9:1109. doi: 10.3389/fpls.2018.01109

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Copyright © 2018 Zhou, Milne, Ma, Song, Fang, Sun and Zha.

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) and the copyright owner(s) 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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Mucuna sempervirens plant. (A) Inflorescence, stems and leaves. (B) The structure of flower, with nectary indicated by an arrow. (C) Different developmental stages of flower. S1 stage, very young flower (corolla less than 1.5 cm long); S2 stage, young flower (corolla ca 2.5 cm long, almost half the length of the adult flower); S3 stage, near adult flower with more than 3 cm long corolla but without enlarged calyx and nectar production; S4 stage, adult flower with nectar in enlarged calyx and keel; S5 stage, old flower with keel opened, and pistil and stamen no longer contained within the keel.