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.


  • Thompson, K. & Drew, B.T.  2021.  Impact of honey bee (Apis mellifera) gathered corn grain dust on young adult bee survival.  Journal of Apicultural Research  doi.org/10.1080/00218839.2021.1962113 
  • 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
  • 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 phylogeny of Lamiaceae: evidence from plastomes. BMC 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.
  • 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.  Lechinia. 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.