For Oenothera
Dietrich, W., and W.L. Wagner. 1988. Systematics of Oenothera section Oenothera subsection Raimannia and subsection Nutantigemma (Onagraceae). Systematic Bot. Monographs 24: 1-91.
Dietrich, W., W.L. Wagner, and P.H. Raven. 1997. Systematics of Oenothera section Oenothera subsection Oenothera (Onagraceae). Systematic Bot. Monographs 50: 1-234.
Munz, P.A. 1938. Studies in Onagraceae XI. A revision of the genus Gaura. Bull. Torrey Bot. Club 65(2): 105-122.
Munz, P.A. 1965. Onagraceae. N. Amer. Fl. II. 5: 1-278.
Sorrie, B.A., R.J. LeBlond, and A.S. Weakley. 2018b. Reassessment of Oenothera fruticosa var. unguiculata. In Weakley, A.S., B.A. Sorrie, R.J. LeBlond, A.J. Floden, E.E. Schilling, A.R. Franck, and J. Kees. 2018b. New combinations, rank changes, and nomenclatural and taxonomic comments in the vascular flora of the southeastern United States. IV. J. Bot. Res. Inst. Texas 12: 461-480.
Straley, G.B. 1977. Systematics of Oenothera sect. Kneiffia (Onagraceae). Ann. Missouri Bot. Gard. 64: 381-424.
Towner, H.F., and P.H. Raven. 1970. A new species and some new combinations in Calylophus (Onagraceae). Madroño 20: 241-245.
Wagner, W.L. 2014. The correct name for a subspecies of Oenothera fruticosa L. (Onagraceae). PhytoKeys 34: 15-17. doi: 10.3897/phytokeys.34.7040
Wagner, W.L. 2021. Oenothera. 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.
Wagner, W.L., K.N. Krakos, and P.C. Hoch. 2013. Taxonomic changes in Oenothera sections Gaura and Calylophus (Onagraceae). PhytoKeys 28: 61-72. doi: 10.3897/phytokeys.28.6143
Wagner, W.L., P.C. Hoch, and J.L. Zarucchi. 2015. The correct name in Oenothera for Gaura drummondii (Onagraceae) PhytoKeys 50: 25–29. doi: 10.3897/phytokeys.50.4886
Wagner, W.L., P.C. Hoch, and P.H. Raven. 2007. Revised classification of the Onagraceae. Syst. Bot. Monographs 83: 1-240.
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