D. A.  Steane, Scotland, R. W., Mabberley, D. J., and OLMSTEAD, R. G., ?Molecular systematics of Clerodendrum (Lamiaceae): ITS sequences and total evidence?, American Journal of Botany, vol. 86, pp. 98?107, 1999.

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.

Y. W.  Yuan and OLMSTEAD, R. G., ?A species-level phylogenetic study of the Verbena complex (Verbenaceae) indicates two independent intergeneric chloroplast transfers?, Molecular Phylogenetics and Evolution, vol. 48, pp. 23?33, 2008.

J. L.  Trusty, OLMSTEAD, R. G., Santos-Guerra, A., Sa-Fontinha, S., and Francisco-Ortega, J., ?Molecular phylogenetics of the Macaronesian-endemic genus Bystropogon(Lamiaceae): palaeo-islands, ecological shifts and interisland colonizations?, Molecular Ecology, vol. 14, pp. 1177?1189, 2005.

J. L.  Trusty, OLMSTEAD, R. G., Bogler, D. J., Santos-Guerra, A., and Francisco-Ortega, J., ?Using molecular data to test a biogeographic connection of the Macaronesian genus Bystropogon (Lamiaceae) to the New World: A case of conflicting phylogenies?, Systematic Botany, vol. 29, pp. 702?715, 2004.

S. J.  WAGSTAFF and OLMSTEAD, R. G., ?Phylogeny of Labiatae and Verbenaceae Inferred from rbcL Sequences?, Systematic Botany, vol. 22, pp. 165?179, 1997.

P. D.  CANTINO, OLMSTEAD, R. G., and WAGSTAFF, S. J., ?A comparison of phylogenetic nomenclature with the current system: a botanical case study?, Systematic Biology, vol. 46, p. 313, 1997.

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.

R. G.  OLMSTEAD, dePamphilis, C. W., Wolfe, A. D., Young, N. D., Elisons, W. J., and Reeves, P. A., ?Disintegration of the Scrophulariaceae?, Am J Bot, vol. 88, p. 348, 2001.