For Heteranthera
Cook. 1998. In Kubitzki, K., ed. 1998b. The families and genera of vascular plants. IV. Flowering plants – Monocotyledons – Alismatanae and Commelinanae (except Gramineae). Springer, Berlin. 511 pp.
Horn, C.N. 1998. Noteworthy collections: North Carolina and Virginia. Castanea 63: 495.
Horn, C.N. 2002c. Heteranthera. In Flora of North America Editorial Committee. 2002a. Flora of North America north of Mexico. Volume 26, Magnoliophyta: Liliidae: Liliales and Orchidales. Oxford Univ. Press, New York, NY. 723 pp.
Horn, C.N. 2020. Two new species of Heteranthera (Pontederiaceae) in North America. J. Bot. Res. Inst. Texas 14: 1-8.
Pellegrini, M.O.O., C.N. Horn, and R.F. Almeida. 2018. Total evidence phylogeny of Pontederiaceae (Commelinales) sheds light on the necessity of its recircumscription and synopsis of Pontederia L. PhytoKeys 108: 25-83.
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