Smoke cued germination occurs in an incredible diversity of plants in widely separated, fire-prone Mediterranean Climate Ecosystems around the world. This research suggests that convergent evolution might be the explaination.
Keeley, J.E., and J.G. Pausas. 2017. Evolution of ‘smoke’ induced seed germination in pyroendemic plants. South African Journal of Botany 115:251-255. https://doi.org/10.1016/j.sajb.2016.07.012