For Steironema
Cholewa, A.F. 2009f. Lysimachia. In Flora of North America Editorial Committee. 2009. Flora of North America north of Mexico. Volume 8, Magnoliophyta: Paeoniaceae to Ericaceae. Oxford Univ. Press, New York, NY. 585 pp.
Estes, D., J. Shaw, and C. Mausert-Mooney. 2015. Lysimachia lewisii (Primulaceae): a new species from Tennessee and Alabama. Phytoneuron 2015-17: 1-15.
Gleason, H.A., and A. Cronquist. 1952. The new Britton and Brown illustrated flora of the northeastern United States and adjacent Canada. New York Botanical Garden and Hafner Press, New York, N.Y.
Mohlenbrock, R.H. 2014. Vascular flora of Illinois: a field guide, 4th edition. SIU Press, Carbondale, IL.
Weakley, A.S., and D.B. Poindexter. Comments on genera in the Lysimachieae and a new combination in Steironema. Pp. 402-403 in In Weakley, A.S., D.B. Poindexter, B.A. Sorrie, E.A. Ungberg, S.G. Ward, J.W. Horn, W.M. Knapp, and S.P. Grund. 2022. Studies in the vascular flora of the southeastern United States. VIII. J. Bot. Res. Inst. Texas 16(2): 377-418.
Yan, H.-F., C.-Y. Zhang, A.A. Anderberg, G. Hao, X.-J. Ge, and J.J. Wiens. 2018. What explains high plant richness in East Asia? Time and diversification in the tribe Lysimachieae (Primulaceae). New Phytologist 219: 436-448.
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