Seemannaralia (Araliaceae) has bilocular ovaries whereas its fruits are unilocular, formed by two adjacent carpels. Oskolski et al. (pp. 29–36) find that the central cavity of these fruits appears by mechanical rupture of the septum by a growing seed. This condition (termed as pseudoparacarpy) has not been reported to date for indehiscent fruits in any taxa other than Seemannaralia.
A. A. Oskolski, D. D. Sokoloff, B.-E. Van Wyk, 2010, 'False paracarpy in Seemannaralia (Araliaceae): from bilocular ovary to unilocular fruit', Annals of Botany, vol. 106, no. 1, pp. 29-36 http://dx.doi.org/10.1093/aob/mcq084