N.  Diane, Hilger, H. H., Förther, H., Weigend, M., and Luebert, F., ?Heliotropiaceae?, in The families and genera of vascular plants, vol. 14, J. W.  Kadereit and Bittrich, V., Eds. Berlin: Springer-Verlag, 2016, pp. 203?211.

M.  Weigend, Luebert, F., Gottschling, M., Couvreur, T. L. P., Hilger, H. H., and Miller, J. S., ?From capsules to nutlets ? Phylogenetic relationships in the Boraginales?, Cladistics, vol. 30, no. 5, pp. 508?518, 2014.