S. J.  WAGSTAFF, OLMSTEAD, R. G., and CANTINO, P. D., ?Parsimony Analysis of cpDNA Restriction Site Variation in Subfamily Nepetoideae (Labiatae)?, Am J Bot, vol. 82, pp. 886?892, 1995.

L. A.  Prather, Monfils, A. K., Posto, A. L., and Williams, R. A., ?Monophyly and phylogeny of Monarda (Lamiaceae): Evidence from the internal transcribed spacer (ITS) region of nuclear ribosomal DNA?, Systematic Botany, vol. 27, pp. 127?137, 2002.

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.

O.  Ryding, ?Pericarp structure and phylogeny of the Lamiaceae-Verbenaceae-complex?, Plant Systematics and Evolution, vol. 198, pp. 101?141, 1995.

M.  Bendiksby, Thorbek, L., Scheen, A. - C., Lindqvist, C., and Ryding, O., ?An updated phylogeny and classification of Lamiaceae subfamily Lamioideae?, Taxon, vol. 60, pp. 471?484, 2011.

A. - C.  Scheen, Bendiksby, M., Ryding, O., Mathiesen, C., Albert, V. A., and Lindqvist, C., ?MOLECULAR PHYLOGENETICS, CHARACTER EVOLUTION, AND SUPRAGENERIC CLASSIFICATION OF LAMIOIDEAE (LAMIACEAE)?, Annals of the Missouri Botanical Garden, vol. 97, pp. 191?217, 2010.

S. J.  WAGSTAFF, Hickerson, L., Spangler, R., Reeves, P. A., and OLMSTEAD, R. G., ?Phylogeny in Labiatae sl, inferred from cpDNA sequences?, Plant Systematics and Evolution, vol. 209, pp. 265?274, 1998.