Nesom, G.L. 2010: Taxonomic notes on Verbena bonariensis (Verbenaceae) and related species in the USA. Phytoneuron 12: 1–16.
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| Nesom, G.L. 2010: Taxonomic notes on Verbena bonariensis (Verbenaceae) and related species in the USA. Phytoneuron 12: 1–16. |