For Circaea
Averett, J.E., and D.E. Boufford. 1985. The flavonoids and flavonoid systematics of Circaea (Circaeeae, Onagraceae). Systematic Bot. 10: 363-373.
Boufford, D.E. 1982 [1983]. The systematics and evolution of Circaea (Onagraceae). Ann Mo. Bot. Gard. 69: 804-994.
Boufford, D.E. 2005. Circaea lutetiana sensu lato (Onagraceae) reconsidered. Harvard Papers in Botany 9: 255-256.
Boufford, D.E. 2021b. Circaea. In Flora of North America Editorial Committee. 2021. Flora of North America north of Mexico. Volume 10, Magnoliophyta: Proteaceae to Elaeagnaceae. Oxford Univ. Press, New York, NY. 456 pp.
Munz, P.A. 1965. Onagraceae. N. Amer. Fl. II. 5: 1-278.
Skvortsov, A.K. 1979. Taxonomy and distribution of Circaea (Onagraceae) in the U.S.S.R. Ann Mo. Bot. Club 66: 880-892.
Wagner, W.L., P.C. Hoch, and P.H. Raven. 2007. Revised classification of the Onagraceae. Syst. Bot. Monographs 83: 1-240.
Xie, L., W.L. Wagner, R.H. Ree, P.E. Berry, and J. Wen. 2009. Molecular phylogeny, divergence time estimates, and historical biogeography of Circaea (Onagraceae) in the Northern Hemisphere. Molec. Phylogen. Evol. 53(3): 995-1009.
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