Welcome to the California Department of Food and Agriculture

Top Left Column Heading

Bottom Left Column Heading


Right Column Heading

Plant Pest Diagnostics Center

Robert Price

Dr. Robert Price

Senior Seed Botanist

Plant Pest Diagnostics Branch, California Department of Food & Agriculture
3294 Meadowview Road, Sacramento, CA 95832-1448, U.S.A.
916-738-6700 office, 916-262-1190 fax, robert.price@cdfa.ca.gov


Quick Links


Curriculum vitae


  • Ph.D. (Botany) – 1987, University of California, Berkeley.
  • M.S. (Botany) – 1979, University of Wisconsin, Madison.
  • B.A. (Biology) – 1976, Cornell University, Ithaca, New York.


  • Systematics of the Brassicaceae.
  • Systematics of the conifers.
  • Molecular systematics.
  • Seed identification and diversity.


  • 2013-present: Senior Seed Botanist, Plant Diagnostics Branch, California Department of Food and Agriculture.
  • 2009-2013: Associate Seed Botanist, Plant Diagnostics Branch, California Department of Food and Agriculture.
  • 2001-2009: Technical Editor and Biological Consultant; advisor to the Conifers Around the World project.
  • 1993-2000: Assistant Professor of Botany, University of Georgia.
  • 1990-1993: Postdoctoral Fellow, Department of Biology, Indiana University.
  • 1987-1990: Postdoctoral Research Associate, Generic Flora of the Southeastern United States project, New York State Museum & Harvard University.


  • 2014-present: Research Associate.  Center for Plant Diversity, Department of Plant Sciences, University of California, Davis


  1. Price, R.A. 2011.Conifer Families. Pages 88-90, in Debreczy, Z. & I. Rácz, Conifers Around The World. DendroPress Ltd., Budapest, 1089 pp.
  2. Price, R.A. 2011. Scientific editor, Debreczy, Z. & I. Rácz, Conifers Around The World. DendroPress Ltd., Budapest, 1089 pp.
  3. Adams, R.P., J. A. Bartel, and R.A. Price. 2009. A new genus, Hesperocyparis, for the cypresses of the Western Hemisphere (Cupressaceae). Phytologia 91: 160-185.
  4. Debreczy, Z., K. Musial, R.A. Price, and I. Racz. 2009. Relationships and nomenclatural status of the Nootka Cypress (Callitropsis nootkatensis, Cupressaceae). Phytologia 91: 140-159.
  5. Huang, J., D.E. Giannasi, and R.A. Price. 2005. Phylogenetic relationships in Ephedra (Ephedraceae) inferred from chloroplast and nuclear DNA sequences. Molecular Phylogenetics and Evolution 35: 48-59.
  6. Huang, J., and R.A. Price. 2003. Estimation of the age of extant Ephedra using chloroplast rbcL sequence data. Molecular Biology and Evolution 20: 435-440.
  7. Quinn, C.J., and R.A. Price. 2003. Phylogeny of the Southern Hemisphere conifers. Acta Horticulturae 615: 129-136.
  8. Quinn, C.J., R.A. Price, and P.A. Gadek. 2002. Familial concepts and relationships in the conifers based on rbcL and matK sequence comparisons. Kew Bulletin 57: 513-531.
  9. Ward, N.M., and R.A. Price. 2002. Phylogenetic relationships of Marcgraviaceae: insights from three chloroplast genes. Systematic Botany 27: 149-160.
  10. Warwick, S.I., I.A. Al-Shehbaz, R.A. Price, and C. Sauder. 2002. Phylogeny of Sisymbrium (Brassicaceae) based on ITS sequences of nuclear ribosomal DNA. Canadian Journal of Botany 80: 1002-1017.
  11. Sweeney, P.W., and R.A. Price. 2001. Multivariate morphological analysis of the Cardamine concatenata alliance (Brassicaceae). Brittonia 53: 82-95.
  12. Price, R.A., I.A. Al-Shehbaz, and S.L. O’Kane. 2001. Beringia (Brassicaceae), a new genus of arabidopsoid affinities from Russia and North America. Novon 11: 332-336.
  13. Sweeney, P.W., and R.A. Price. 2000. Polyphyly of the genus Dentaria (Brassicaceae): evidence from trnL intron and ndhF sequence data. Systematic Botany 25: 468-478.
  14. Zhang, D., M.A. Dirr, and R.A. Price. 2000. Discrimination and genetic diversity of Cephalotaxus accessions using AFLP markers. Journal of the American Society of Horticultural Science 125: 404-412.
  15. Al-Shehbaz, I.A., and R.A. Price. 1998. Delimitation of the genus Nasturtium (Brassicaceae). Novon 8: 124-126.
  16. Galloway, G. L., R.L. Malmberg, and R.A. Price. 1998. Phylogenetic utility of the nuclear gene arginine decarboxylase: an example from the Brassicaceae. Molecular Biology and Evolution 15: 1312-1320.
  17. Price, R.A., A. Liston, and S.H. Strauss. 1998. Phylogeny and systematics of Pinus. Pp. 49-68 in D.M. Richardson, ed., Ecology and Biogeography of Pinus. Cambridge Univ. Press.
  18. Edwards-Burke, M.A., J.L. Hamrick, and R.A. Price. 1997. Frequency and direction of hybridization in sympatric populations of Pinus taeda and P. echinata (Pinaceae). American Journal of Botany 84: 879-886.
  19. Pax, D. L., R. A. Price, and H. J. Michaels. 1997. Phylogenetic position of the Hawaiian geraniums based on rbcL sequences. American Journal of Botany 84: 72-78.
  20. Jones, C.S., and R.A. Price. 1996. Diversity and evolution of seedling baupläne in Pelargonium (Geraniaceae). Aliso 14: 281-295.
  21. Rodman, J., R. A. Price, K. Karol, E. Conti, K. J. Sytsma, and J. D. Palmer. 1993. Nucleotide sequences of the rbcL gene indicate monophyly of mustard oil plants. Annals of the Missouri Botanical Garden 80: 686-699.
  22. Price, R.A., and J.D. Palmer. 1993. Phylogenetic relationships of the Geraniaceae and Geraniales from rbcL sequence comparisons. Annals of the Missouri Botanical Garden 80: 661-671.
  23. Price, R.A., and R.C. Rollins. 1991. New taxa of Draba (Cruciferae) from California, Nevada, and Colorado. Harvard Papers in Botany 3: 71-77.
  24. Hart, J.A., and R.A. Price. 1990. The genera of Cupressaceae (including Taxodiaceae) in the southeastern United States. Journal of the Arnold Arboretum 71: 275-322.
  25. Price, R.A. 1990. The genera of Taxaceae in the southeastern United States. Journal of the Arnold Arboretum 71: 69-91.
  26. Price, R.A. 1989. The genera of Pinaceae in the southeastern United States. Journal of the Arnold Arboretum 70: 247-305.
  27. Price, R.A.,and J.M. Lowenstein. 1989. An immunological comparison of the Sciadopityaceae, Taxodiaceae, and Cupressaceae. Systematic Botany 14: 141-149.
  28. Price, R.A., and R.C. Rollins. 1988. High elevation Draba (Cruciferae) of the White Mountains of California and Nevada. Aliso 12: 17-27.
  29. Price, R.A., J. Olsen-Stojkovich, and J.M. Lowenstein. 1987. Relationships among the genera of Pinaceae: an immunological approach. Systematic Botany 12: 91-97.
  30. Price, R. A. 1980. Draba streptobrachia (Brassicaceae), a new species from Colorado. Brittonia 32: 160-169.


  • Introductory Botany
  • Plant Taxonomy
  • Dendrology


  • Principles of Plant Systematics
  • Computer Assisted Methods in Plant Systematics
  • Biology of the Conifers (Seminar Coordinator)
  • Origins and Diversity of Crop Plants (Seminar Coordinator)


  • Seed and Fruit Identification in Brassicaceae. CDFA, Sacramento, California
  • Identification of Genera of Brassicaceae. University of Colorado, Boulder
  • Species identification in Draba (Brassicaceae). University of Colorado, Boulder


  • American Association for the Advancement of Science (1982-present)
  • American Society of Plant Taxonomists (1979-present)
  • Botanical Society of America (1980-present)
  • International Society of Plant Taxonomists (1986-present)