M.  Bendiksby, Brysting, A. K., Thorbek, L., Gussarova, G., and Ryding, O., ?Molecular phylogeny and taxonomy of the genus Lamium L. (Lamiaceae): Disentangling origins of presumed allotetraploids?, Taxon, vol. 60, pp. 986?1000, 2011.

C. E.  Edwards, Soltis, D. E., and Soltis, P. S., ?Molecular phylogeny of Conradina and other scrub mints (Lamiaceae) from the southeastern USA: Evidence for hybridization in Pleistocene refugia??, Systematic Botany, vol. 31, pp. 193?207, 2006.