Tyrl, R.J., T.G. Bidwell, R.E. Masters, and R.D. Elmore. 2008. Field Guide to Oklahoma Plants. Commonly Encountered Prairie, Shrubland, and Forest Species. 2nd Edition. Oklahoma State University, Stillwater, Oklahoma.

Tyrl, R.J. 2010. Being a method proposed for the ready finding…to what sort any plant belongeth. Oklahoma Native Plant Record 10:77-84.

Burrows, G.E. and R.J. Tyrl. 2013. Toxic Plants of North America, 2nd Edition. Wiley-Blackwell, New York.

Springer, T.L., S.A. Gunter, R.J. Tyrl, and P.F. Nighswonger. 2013. Drought and grazing effects on Oklahoma Phlox (Polemoniaceae, Phlox oklahomensis). American Journal of Plant Sciences 4:9–13.

Tyrl, R.J. and P. Shryock. 2013. Cavalcade of Field Botanists: Contributors to our knowledge of the flora and vegetation of Oklahoma. Oklahoma Native Plant Record 13:55–101.

Gard, M.E., C.R.H. York, W.F. Lowry, S. Hensley, and R.J. Tyrl. 2014. A floristic inventory of six tracts of the Ozark Plateau National Wildlife Refuge, Adair County, Oklahoma. Proc. Oklahoma Acad. Sci. 94:59–69.

Tyrl, R.J., S.C. Barber, W.J. Elisens, J.R. Estes, P. Folley, C. L. Murray, B.A. Smith, C.E.S. Taylor, R.A. Thompson, J.B. Walker, and L.E. Watson. 2015. Flora of Oklahoma Keys and Descriptions. Flora Oklahoma Inc., Oklahoma City, Oklahoma.

Tyrl, R.J., S.C. Barber, P. Buck, J.R. Estes, P. Folley, L.K. Magrath, C.E.S. Taylor, and R.A. Thompson. (continuing publication)
Keys & Descriptions for the Vascular Plants of Oklahoma. Flora Oklahoma Inc., Noble, Oklahoma.

Burrows, G.E. and R.J. Tyrl. 2006. Handbook of Toxic Plants of North America. Blackwell Publishing, Ames, Iowa.

Crandall, R.M. and R.J. Tyrl. 2006. Vascular flora of the Pushmataha Wildlife Management Area, Pushmataha County, Oklahoma. Castanea 71:15-30.

Richards, L. and R.J. Tyrl. 2005. Dyes from American Native Plants: A Practical Guide. Timber Press, Portland, Oregon.

Littlefield, L.J., S.M. Marek, R.J. Tyrl, and K.S. Winkelman. 2005. Morphological and molecular characterization of Puccinia lagenophorae, now present in central North America. Annals Appl. Biol. 147:1-8.

Medlin, C. and R.J. Tyrl. 2005. Grass Weeds of Oklahoma Wheat Fields and Their Identification. OSU Extension Fact Sheet No. L-316. Oklahoma Cooperative Extension Service, Stillwater, OK.

Coleman, S.W., C.M. Taliaferro, and R.J. Tyrl. 2004. The Old World Bluestems. pp. 909-936. IN: L.E. Moser, B.L. Burson, and L.E. Sollenberger (editors). Warm-Season (C4) Grasses. American Society of Agronomy Monographs No. 45. American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America Publishers, Madison Wisconsin.

Springer, T.L. and R.J. Tyrl. 2003. Status of Phlox oklahomensis (Polemoniaceae) in northwestern Oklahoma and adjacent Kansas. Proc. Oklahoma Acad. Sci. 83:89-92.

Tyrl, R.J., T.G. Bidwell, and R.E. Masters. 2002. Field Guide to Oklahoma Plants. Commonly Encountered Prairie, Shrubland, and Forest Species.Oklahoma State University, Stillwater, Oklahoma.

Burrows, G.E. and R.J. Tyrl. 2001. Toxic Plants of North America. Iowa State University Press, Ames, Iowa.

Smith, B.A., R.J. Tyrl, and R.E. Master. 1997. Floristic inventory of the McCurtain County Wilderness Area, Oklahoma. Proc.Oklahoma Acad. Sci. 77:99-102.

Prather, L.A., R.J. Tyrl, and W.D. Warde 1995. A taxonomic investigation of Cuscuta attenuata (Cuscutaceae) and related taxa. Sida 16:447-458.