Cardoso, P. H., L. Menini Neto, N. S. Somavilla, and M. Trovó. “A Morphometric Approach and Recircumscription of the Stachytarpheta Longispicata Complex (Verbenaceae)”. European Journal of Taxonomy, vol. 833, no. 1, July 2022, pp. 12-45, doi:10.5852/ejt.2022.833.1881.