Acknowledgements We thank Y-Z. Cun, Y-B. Gong, J-K. Li, C-Q. Liu, S-S. Xie, and X-Q. Zhu for help in the field. We also thank L. Delph and J. Pannell for valuable comments on this project. This work was supported by the National Natural Science Foundation of China (Grant No. 31030016).
Compared to pollinator limitation and inbreeding avoidance, the role of ecological factors in sexual differentiation has received less attention in sexual dimorphic plants. The effect of soil moisture and florivory on...