Recent phylogenetic work has demonstrated that the ability of species of the angiosperm family Nyctaginaceae to self-fertilize is evolutionarily labile. However, the potential for further investigation of the evolution of mating systems in the family is limited, because there is no information on reproductive biology for several genera. I performed an experiment on a natural population of Tripterocalyx carneus to determine whether this species is self-compatible. Individual flowers were emasculated, bagged to exclude pollinators, or both. Flowers that were bagged but not emasculated set viable fruit in the majority of cases, which demonstrates that this species is self-compatible.