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

References

• Abrams, L. & R. S. Ferris. 1960. Bignonias to Sunflowers. 4: 732 pp. In L. Abrams Ill. Fl. Pacific States. Stanford University Press, Stanford.
• Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville.
• CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Ca. nat. México. CONABIO, Mexico City.
• Cekalovic K. 1985. Catálogo de Opiliones de Chile (Arachnida). Boletín de la Sociedad de Biología de Concepción (Chile) 56: 7-29. Cakalovic K. 1976. Catálogo de los Arachnida: Scorpiones, Pseudoscorpiones, Opiliones, Acari, Aranea y Solifugae de la XII Región de Chile, incluyendo la Antártica chilena (Chile). Gayana Zool. (Chile) 37: 1-108.
• 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. 1980. Asteraceae. 1: i–xv, 1–261. In Vasc. Fl. S.E. U. S. The University of North Carolina Press, Chapel Hill.
• Cronquist, A. J. 1994. Vascular plants of the intermountain west, U.S.A. 5: 1–496. In A. J. Cronquist, A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren (eds.) Intermount. Fl. Hafner Pub. Co., New York.
• Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
• Flora of North America @ eFloras.org
• Flora of North America Editorial Committee, e. 2006. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. 20: i–xxii + 1–666. In Fl. N. Amer. Oxford University Press, New York.
• Gleason, H. A. & A. Cronquist. 1991. Man. Vasc. Pl. N.E. U.S. (ed. 2) i–lxxv, 1–910. New York Botanical Garden, Bronx.
• 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.
• Hickman, J. C. 1993. Jepson Man.: Higher Pl. Calif. i–xvii, 1–1400. University of California Press, Berkeley.
• Hilty, J. Editor. 2010. Insect Visitors of Illinois Wildflowers. World Wide Web electronic publication. flowervisitors.info, version (09/2010).
  See: Abbreviations for Insect Activities, Abbreviations for Scientific Observers, References for behavioral observations
• Hitchcock, C. L., A. Cronquist, M. Ownbey & J. W. Thompson. 1984. Compositae. Part V. 343 pp. In Vasc. Pl. Pacific N.W. University of Washington Press, Seattle.
• Isotype: Rydberg, P. A. 1904. Bull. Torrey Bot. Club. 31: 647.
• 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.
• Moss, E. H. 1983. Fl. Alberta (ed. 2) i–xii, 1–687. University of Toronto Press, Toronto.
• Munz, P. A. & D. D. Keck. 1959. Cal. Fl. 1–1681. University of California Press, Berkeley.
• Munz, P. A. 1974. Fl. S. Calif. 1–1086. University of California Press, Berkeley.
• Nesom, G. L. 1990. Studies in the systematics of Mexican and Texan Grindelia (Asteraceae: Astereae. Phytologia 68(4): 303–332.
• Porsild, A. E. & W. Cody. 1980. Vasc. Pl. Continental Northw. Terr. Canada i–viii, 1–607. National Museum of Natural Sciences, Ottawa.
• SPECIMEN BASED RECORD. Published protolog data.
• Scoggan, H. J. 1979. Dicotyledoneae (Loasaceae to Compositae). Part 4. 1117–1711 pp. In Fl. Canada. National Museums of Canada, Ottawa.
• Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.
• Voss, E. G. 1996. Michigan Flora, Part III: Dicots (Pyrolaceae-Compositae). Cranbrook Inst. of Science, Ann Arbor.