The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.

References

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• Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville.
• Barringer, K. & W. Burger. 2000. Family 193. Scrophulariaceae. In: W. Burger (ed.), Flora Costaricensis. Fieldiana, Bot., n.s. 41: 1–69.
• Breedlove, D. E. 1986. Flora de Chiapas. Listados Floríst. México 4: i–v, 1–246.
• Böcher, T. W., K. Holmen & K. Jacobsen. 1968. Fl. Greenland (ed. 2) 312 pp.
• CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, Mexico City.
• Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.
• Cronquist, A. J., A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren. 1984. Vascular Plants of the Intermountain West, U.S.A. 4: 1–573. In A. J. Cronquist, A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren (eds.) Intermount. Fl. Hafner Pub. Co., New York.
• D'Arcy, W. G. 1987. Flora of Panama. Checklist and Index. Part 1: The introduction and checklist. Monogr. Syst. Bot. Missouri Bot. Gard. 17: v–xxx, 1–328.
• Dawson, G. 1965. Boraginaceae, Scrophulariaceae, Orobanchaceae, Lentibulariaceae, Acanthaceae in A. Burkart. 4(5): 100–121; 251–298; 304–331. In A. L. Cabrera Fl. Prov. Buenos Aires. Instituto Nacional de Tecnología Agropecuaria, Buenos Aires.
• Dawson, G. 1979. Scrophulariaceae in A. Burkart. 5: 453–504. In A. Burkart Fl. Il. Entre Ríos. Instituto Nacional de Tecnología Agropecuaria, Buenos Aires.
• Edwin, G. 1971. Scrophulariaceae. In: J. F. Macbride, Flora of Peru. Publ. Field Mus. Nat. Hist., Bot. Ser. 13(5B/3): 461–717.
• Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
• Flora of China Editorial Committee. 1998. Fl. China 18: 1–449. Science Press & Missouri Botanical Garden Press, Beijing & St. Louis.
• Gibbs Russell, G. E., W. G. Welman, E. Reitief, K. L. Immelman, G. Germishuizen, B. J. Pienaar, M. v. Wyk & A. Nicholas. 1987. List of species of southern African plants. Mem. Bot. Surv. S. Africa 2(1–2): 1–152(pt. 1), 1–270(pt. 2).
• Gleason, H. A. 1968. The Sympetalous Dicotyledoneae. vol. 3. 596 pp. In H. A. Gleason Ill. Fl. N. U.S. (ed. 3). New York Botanical Garden, New York.
• Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
• Hilty, J. Editor. 2013. Illinois Wildflowers. World Wide Web electronic publication. flowervisitors.info, version 04/2013.
  See: Botanical Terminology and Line Drawings,  Ecological Terminology,  Website Description,  Links to Other Websites,  Reference Materials
• Hilty, J. Editor. 2013. Insect Visitors of Illinois Wildflowers.   World Wide Web electronic publication. illinoiswildflowers.info, version (05/2013)  
  See:   Abbreviations for Insect Activities,   Abbreviations for Scientific Observers,   References for behavioral observations
• Holmgren, N. H. & U. Molau. 1984. 177. Scrophulariaceae. 21: 1–189. In G. W. Harling & B. B. Sparre (eds.) Fl. Ecuador. University of Göteborg and Swedish Museum of Natural history, Göteborg and Stockholm.
• Jørgensen, P. M. & C. Ulloa Ulloa. 1994. Seed plants of the high Andes of Ecuador---A checklist. AAU Rep. 34: 1–443.
• Jørgensen, P. M. & S. León-Yánez. (eds.) 1999. Catalogue of the vascular plants of Ecuador. Monogr. Syst. Bot. Missouri Bot. Gard. 75: i–viii, 1–1181.
• Luteyn, J. L. 1999. Páramos, a checklist of plant diversity, geographical distribution, and botanical literature. Mem. New York Bot. Gard. 84: viii–xv, 1–278.
• Marticorena C & R Rodríguez . 1995-2005. Flora de Chile. Vols 1, 2(1-3). Ed. Universidad de Concepción, Concepción. 351 pp., 99 pp., 93 pp., 128 pp. Matthei O. 1995. Manual de las malezas que crecen en Chile. Alfabeta Impresores. 545 p.
• Marticorena, C. & M. Quezada. 1985. Catálogo de la Flora Vascular de Chile. Gayana, Bot. 42: 1–157.
• Munz, P. A. & D. D. Keck. 1959. Cal. Fl. 1–1681. University of California Press, Berkeley.
• Méndez-Larios, I. & J. L. Villaseñor Ríos. 2001. La familia Scrophulariaceae in México: diversidad y distribución. Bol. Soc. Bot. México 69: 101–121.
• Orrell T. (custodian) (2013). ITIS Regional: The Integrated Taxonomic Information System (version Apr 2011). In: Species 2000 & ITIS Catalogue of Life, 11th March 2013 (Roskov Y., Kunze T., Paglinawan L., Orrell T., Nicolson D., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Hernandez F., De Wever A., eds). Digital resource at www.catalogueoflife.org/col/. Species 2000: Reading, UK.
• Radford, A. E., H. E. Ahles & C. R. Bell. 1968. Man. Vasc. Fl. Carolinas i–lxi, 1–1183. University of North Carolina Press, Chapel Hill.
• Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.
• Standley, P. C. & L. O. Williams. 1973. Scrophulariaceae. In Standley, P. C. & L. O. Williams (eds.), Flora of Guatemala - Part IX, Number 4. Fieldiana, Bot. 24(9/4): 319–416.
• Veronica arvensis
• Zuloaga, F. O., O. Morrone, M. J. Belgrano, C. Marticorena & E. Marchesi. (eds.) 2008. Catálogo de las Plantas Vasculares del Cono Sur (Argentina, Sur de Brasil, Chile, Paraguay y Uruguay). Monogr. Syst. Bot. Missouri Bot. Gard. 107(1): i–xcvi, 1–983; 107(2): i–xx, 985–2286; 107(3): i–xxi, 2287–3348.