Breynia cernua is a species of flowering plant that grows naturally in Australia and Malesia as a shrub up to in height. It is presumably dependent on leafflower moths (Epicephala spp.) for its pollination, like other species of tree in the genus Breynia.Kawakita, A.; Kato, M. 2004. Obligate pollination mutualism in Breynia (Phyllanthaceae): further documentation of pollination mutualism involving Epicephala moths (Gracillariidae). American Journal of Botany. 91: 1319–1325Zhang, J.; Wang, S.; Li, H.; Hu, B.; Yang, X.; Wang, Z. 2012. "Diffuse coevolution between two Epicephala species (Gracillariidae) and two Breynia species (Phyllanthaceae). PLOS ONE. 7: e41657. The species is known by the rather unfortunate name of fart bush.
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