Dr. Bryan Drew

Associate Professor

Office: BHS 344   |    Phone: (308) 865-8883   |    Email: drewbt@unk.edu

Dr. Bryan Drew


Areas of Interest:

  • Phylogenetics and evolution of the Lamiaceae, especially the genera Agastache, Lepechinia, Monardella, and Salvia
  • Temporal and spatial origin of the California Floristic Province flora
  • Plant speciation processes in Western North America
  • Pollination biology
  • Conservation genetics
  • Salmon habitat restoration
  • River and stream rehabilitation


Professional Affiliations:

  • California Native Plant Society
  • Botanical Society of America
  • California Botanical Society
  • Union of Concerned Scientists
  • Salmon Restoration Federation
  • International Association for Plant Taxonomy


  • Drew, B. T. 2011. Phylogenetics and biogeography of Lepechinia (Lamiaceae), and evolutionary studies within the Mentheae tribe. Ph. D. Dissertation, University of Wisconsin - Madison. 249 pp.


  • Zhao, F., Wua, Y.W., Drew, B.T., Yao, G., Chen, T.P., Cai, J., Liu, E.D., Li, B., & Xiang, C.L. 2021. Systematic placement of the enigmatic Southeast Asian genus Paralamium and an updated phylogeny of tribe Pogostemoneae (Lamiaceae subfamily Lamioideae). Frontiers in Plant Science, doi.org/10.3389/fpls.2021.646133
  • Rose, J.P., Kriebel, R., Kahan, L., DiNicola, A., Gonzalez-Gallegos, J.P., Celep, F., Lemmon, E.M., Lemmon, A.R., Sytsma, K.A, and Drew, B.T. 2021. Sage insights into the phylogeny of salvia: dealings with sources of discordance within and across genomesFrontiers in Plant Science, doi.org/10.3389/fpls.2021.767478
  • Zhao, F., Chen, Y.P., Salmaki, Y., Drew, B.T., Wilson, T.C., Scheen, A.C. Celep, F., Bräuchler, B., Bendiksby, M., Wang, Q., Min, D.Z., Peng, H., Olmstead, R.G., Li, B., & Xiang, C.L. 2021. An updated tribal classification of Lamiaceae based on plastome phylogenomicsBMC Biology, 19:1-27.
  • Celep, F., Radars, E., and Drew, B.T. 2020. Two new hybrid species of Salvia (S. x karamanensis and S. x doganii) from Turkey: evidence from molecular and morphological studies. Turkish Journal of Botany, 44:647-660.
  • Drew, B.T. 2020. Evolution, pollination biology, and species richness of Salvia (Lamiaceae). International Journal of Plant Sciences, 181:767-769.
  • Zhao, F., Drew, B.T., Chen, Y.P., Hu, G.X., Li, B., and Xiang, C.L. 2020. The chloroplast genome of Salvia: genomic characterization and phylogenetic analysis. International Journal of Plant Sciences, 181:812-830.
  • Zhao F., Li B., Drew, B.T., Chen, Y.P., Wang, Q., Yu, W.B., Liu, E.D., Salmaki, Y., Peng, H., & Xiang, C.L. 2020. Leveraging plastomes for comparative analysis and phylogenomic inference within Scutellarioideae (Lamiaceae)PLoS ONE, 5:e0232602
  • Hu, G.X., Liu, E.D., Wu, Z.K., Sytsma, K.J., Drew, B.T., and Xiang, C.L. 2020. Integrating DNA sequences with morphological analysis clarifies phylogenetic position of Salvia grandifolia (Lamiaceae): an enigmatic species endemic to southwestern China. International Journal of Plant Sciences, 181:787-799.
  • Kriebel, R., Drew, B.T., González-Gallegos, J.G., Celep, F., Mahdjoub, M.M., Heeg, L., & Sytsma K.J. 2020. Pollinator shifts, contingent evolution, and evolutionary constraint drive the diversification of Salvia (Lamiaceae) flowers: evidence from morphometrics and phylogenetic comparative methods. Evolution, 74: 1335-1355.
  • Drew, B.T. 2020. A fresh look at Rosemary. In Essence, 18: 42–44.
  • Mota, M., Drew, B.T., & Pastore, J.F.B. 2020. Salvia rupestris (Lamiaceae), a new species endemic to the Arapuá Mountains in Pernambuco State, Brazil. Brittonia, doi.org/10.1007/s12228-020-09617-w
  • Drew, B.T. 2019. Lepechinia. Flora of North America North of Mexico Vol. 16: Lamiales.
  • Antar, G., Harley, R.M., Sano, P.T., and Drew, B.T. 2019. The genus Lepechinia Willd. (Lamiaceae - Salviinae) in Brazil. Acta Botanica Brasilica, 33:592-601.
  • Elvin, M.A., Kelley, R.B. & Drew, B.T. 2019. Trichome Morphology Relates to Taxonomic Diversity in Monardella in the lower Snake River Watershed of Idaho and Oregon, USA: Taxonomic Studies in Monardella (Lamiaceae) VI. The Journal of the Torrey Botanical Society, 146:299-313.
  • Kriebel, R., Drew, B.T., Drummond, C.P., González-Gallegos, J.G., Celep, F., Mahdjoub, M.M., Rose, J.P., Xiang, C.L., Hu, G.X., Walker, J.B., Lemmon, E.M., Lemmon, A.R., & Sytsma K.J. 2019. Tracking the temporal shifts in area, biomes, and pollinators in the radiation of Salvia (sages, Lamiaceae) across continents: leveraging Anchored Hybrid Enrichment and targeted sequence data. American Journal of Botany, 106:573-597.
  • Shao, M.N., Qu, B., Drew, B.T., Xiang, C.L., Miao, Q., & Luo, S.H. 2019. Outbreak of a New Alien Invasive Plant Salvia reflexa in Northeast China. Weed Research, 59:201-208.
  • Spalink, D., Kriebel, R., Li, P., Pace, M.C., Drew, B.T., Zaborsky, J.G., Rose, J., Givnish, T.J., Feist, M.A., Alverson, W.S., Waller, D.M., Cameron, K.M., & Sytsma, K.J. 2018. Spatial phylogenetics reveals evolutionary constraints on the assembly of a large regional flora. American Journal of Botany, 105:1038-1050.
  • Barrabé, L., Lavergne, S., Karnadi-Abdelkader, G., Drew, B.T., Birnbaum, P., & Gâteblé, G. 2018. Changing Ecological Opportunities Facilitated the Explosive Diversification of New Caledonian Oxera (Lamiaceae). Systematic Biology, 68:460-481.
  • Hu, G.X., Takano, A., Drew, B.T., Liu, E.D., Soltis, D.E., Soltis, P.S., Peng, H., & Xiang, C.L. 2018. Phylogeny and staminal evolution of Salvia (Lamiaceae, Nepetoideae) in East Asia. Annals of Botany, 122:649-668.
  • Rose, J., Kleist, T., Schönenberger, J., Drew, B.T., Sytsma, K.J., & Löfstrand, S. 2018. Phylogeny, historical biogeography, and diversification of angiosperm order Ericales suggest ancient Neotropical and East Asian connections. Molecular Phylogenetics and Evolution, 122:59-79.
  • Xiang, C.L., Zhao, F., Cantino P.D., Drew, B.T., Li, B., Liu. E., Solits, D.E., Pamela P.S., & Peng, H. 2018. Molecular systematics of Caryopteris (Lamiaceae) and its allies with reference to the molecular phylogeny of subfamily Ajugoideae. Taxon, 67:376-394.
  • Drew, B.T., Liu, S., Bonifacino, J.B., & Sytsma, K.J. 2017. Amphitropical disjunctions in New World Menthinae: three Pliocene dispersals to South America following late Miocene dispersal to North America from the Old World. American Journal of Botany, 104:1695-1107.
  • McTavish, E.J., Drew, B.T., Redelings, B., & Cranston, K. 2017. How and why to build a unified tree of life. Bioessays, doi:10.1002/bies.201700114
  • Yu, X.Q., Drew, B.T., Yang, J.B., Gao, L.M. & Li, D.Z. 2017. Comparative chloroplast genomes of eleven Schima (Theaceae) species: Insights into DNA barcoding and phylogeny. PloS ONE, 12(6) p.e0178026.
  • Drew, B.T., González-Gallegos, J.G., Xiang, C.L., Kriebel, R., Drummond, C.P., Walker, J., & Sytsma, K.J. 2017. Salvia united: The greatest good for the greatest number. Taxon, 66:133-145.
  • Spalink, D., Drew, B.T., Pace, M.C., Zaborsky, J.G., Cameron, K. & Sytsma, K.J. 2016. Evolution of geographical place and niche space: patterns of diversification in the North American sedge (Cyperaceae) flora. Molecular Phylogenetics and Evolution, 95:183-195.
  • Chen, Y.P., Drew, B.T., Li, B., Soltis, D.E., Soltis, P.E. & Xiang, C.L. 2016.Resolving the phylogenetic position of Ombrocharis (Lamiaceae), with reference to the molecular phylogeny of tribe Elsholtzieae. Taxon, 65:123-136.
  • Yao, G., Drew, B.T., Yi, T.S., Yan, H.F., Yuan, Y.M. & Ge, X.J. 2016. Phylogenetic relationships, character evolution and biogeographic diversification of Pogostemon s.l. (Lamiaceae). Molecular Phylogenetics and Evolution, 98:184-200.
  • Spalink, D., Drew, B.T., Pace, M.C., Zaborsky, J.G., Starr, J.R., Cameron, K. & Sytsma, K.J. 2016. Biogeography of the cosmopolitan sedges (Cyperaceae) and the area-richness correlation in plants. Journal of Biogeography, 43:1893-1904.
  • Hinchliff, C., Smith, S.A., Allman, J.F., Burleigh, J.G., Chaudhary, R., Cognill, L.M., Crandall, K.A., Deng, J., Drew, B.T.,…et al. 2015. Synthesis of phylogeny and taxonomy into a comprehensive tree of life. Proceedings of the National Academy of Sciences, doi:
  • Walker, J.B., Drew, B.T. & Sytsma, K.J. 2015. Unraveling species relationships within the iconic California floristic province sages (Salvia subgenus Audibertia, Lamiaceae). Systematic Botany, 40:826-844.
  • González-Gallegos, J.G., Drew, B.T. & Cuevas-Guzmán, R. 2015. Novelties on the distribution of Lepechinia flammea (Lamiaceae), rediscovery of L. glomerata in Jalisco, Mexico, and their phylogenetic position within Lepechinia. Botanical Sciences, 93:299-312.
  • Deng, J., Drew, B.T., Mavrodiev, E.V., Gitzendanner, M.A., Soltis, P.S. & Soltis, D.E. 2015. Phylogeny, divergence times, and historical biogeography of the angiosperm family Saxifragaceae. Molecular Phylogenetics and Evolution, 83:86-98.
  • Deng, T., Nie, Z.L., Drew, B.T., Volis, S., Kim, C., Xiang, C.L., Wang, Y.H. & Sun, H. 2015. Does the arcto-tertiary biogeographic hypothesis explain the disjunct distribution of northern hemisphere herbaceous plants? The case of Meehania (Lamiaceae). PLoS ONE, 10:2 e0117171-e0117171.
  • Yu, Q., Maki, M., Drew, B.T., Paton, A.J., Li, H., Zhao, J., Conran, J.G. & Li, J. 2014. Phylogeny and historical biogeography of Isodon (Lamiaceae): rapid radiation in south-west China and Miocene overland dispersal into Africa. Molecular Phylogenetics and Evolution, 77:183-194.
  • Drew, B.T., Cacho, N.I. & Sytsma, K.J. 2014. The transfer of two rare monotypic genera, Neoeplingia and Chaunostoma, to Lepechinia (Lamiaceae), and notes on their conservation. Taxon, 63:831-842.
  • Drew, B.T., Ruhfel, B.R., Smith, S.A., Moore, M.J., Briggs, B.G., Gitzendanner, M.A., Soltis, P.S. & Soltis, D.E. 2014. Another look at the root of the angiosperms reveals a familiar tale. Systematic Biology, 63:368-382.
  • Sulman, J.D., Drew, B.T., Drummond, C., Hayasaka, E. & Sytsma, K.J. 2013. Systematics, biogeography, and character evolution of Sparganium (Typhaceae): diversification of a widespread, aquatic lineage. American Journal of Botany, 100:2023-2039.
  • Drew, B.T., Gazis, R., Cabezas-Padilla, P., Swithers,, K.S., Deng, J., Rodriguez, R., Katz, L.A., Crandall, K.A., Hibbett, D.S. & Soltis, D.E. 2013. Lost branches on the tree of life. PLoS Biology, 11(9):e1001636.
  • Drew, B.T. 2013. Data deposition: missing data mean holes in tree of life. Nature, 493(7432):305-305.
  • Drew, B.T. & Sytsma, K.J. 2013. The South American radiation of Lepechinia (Lamiaceae): phylogeny, divergence times, and evolution of dioecy. Botanical Journal of the Linnean Society, 171:171-190.
  • Drew, B.T. & Sytsma, K.J. 2012. Phylogenetics, biogeography, and staminal evolution in the tribe Mentheae (Lamiaceae). American Journal of Botany, 99:933-953.
  • Drew, B.T. & Sytsma, K.J. 2011.Testing the monophyly and placement of Lepechinia in the tribe Mentheae (Lamiaceae). Systematic Botany, 36:1038-1049.
  • Katinas L, Crisci, J.V., Jabaily, R.S., Williams, C., Walker, J., Drew, B.T., Bonifacino, J.M. & Sytsma, K.J. 2008. Evolution of secondary heads in Nassauviinae (Asteraceae, Mutisieae). American Journal of Botany, 95:229-240.
  • Drew, B.T. & Knorr, J. 2005. Rare bryophytes and lichens of the Klamath National Forest. Scott River Ranger District, Klamath National Forest. USFS.
  • Fetcho, K. & Drew, B.T. 2001. 2000-2001 Chinook and Coho spawning report. Lower Trinity Ranger District, Six Rivers National Forest. USFS.