For Verbena
Atkins. 2004. In Kadereit, J.W. 2004. The families and genera of vascular plants. VII. Flowering plants – Dicotyledons – Lamiales (except Acanthaceae including Avicenniaceae). Springer, Berlin. 478 pp.
Barber, S.C. 1982. Taxonomic studies in the Verbena stricta complex (Verbenaceae). Systematic Bot. 7: 433-456.
Jiménez-Mejías, P., and R.F.C. Naczi. 2019. Critical comments on the types of two 19th-century North American plant names. Brittonia.
Nesom, G.L. 2010b. Infrageneric classification of Verbena (Verbenaceae). Phytoneuron 2010-11: 1-15.
Nesom, G.L. 2010c. Taxonomic notes on Verbena bonariensis (Verbenaceae) and related species in the USA. Phytoneuron 2010-12: 1-16.
Nesom, G.L. 2010d. Taxonomy of Verbena urticifolia (Verbenaceae) and its close relatives. Phytoneuron 2010-14: 1-14.
O’Leary, N., M.E. Múlgara, and O. Morrone. 2007. Revisión taxonómica de las especies del género Verbena (Verbenaceae): serie Pachystachyae. Ann. Missouri Bot. Gard. 94: 571-621.
Verloove, F. 2011. Verbena incompta (Verbenaceae), an overlooked xenophyte in Europe. Willdenowia 41: 39-49.
Yuan, Y.-W., and R.G. Olmstead. 2008. A species-level phylogenetic study of the Verbena complex (Verbenaceae) indicates two independent intergeneric chloroplast transfers. Molec. Phylogen. & Evol. 48: 23-33.
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