References
For Phryma
Barker, W.R., G.L. Nesom, P.M. Beardsley, and N.S. Fraga. 2012. A taxonomic conspectus of Phrymaceae: A narrowed circumscription for Mimulus, new and resurrected genera, and new names and combinations. Phytoneuron 2012-39: 1–60. Google Scholar
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Thieret, J.W. 1972. The Phrymaceae in the southeastern United States. J. Arnold Arb. 53: 226-233. Google Scholar
Wagstaff, S.J., and R.G. Olmstead. 1997. Phylogeny of Labiatae and Verbenaceae inferred from rbcL sequences. Systematic Bot. 22: 165-179. Google Scholar
Walker, J.B. 2019. Phryma. In Flora of North America Editorial Committee. 2019. Flora of North America north of Mexico. Volume 17, Magnoliophyta: Tetrachondraceae to Orobanchaceae. Oxford Univ. Press, New York, NY. 737 pp. Google Scholar