Watson, John Michael, and ANA ROSA FLORES. 2014. “Upping Their Number, Addressing Their Risk. <em>Viola singularis</em> (Violaceae) Revisited, and an Evaluation of Sect. <em>Andinium</Em>, Its Higher Taxonomic Group”. Phytotaxa 177 (3):177–182. https://doi.org/10.11646/phytotaxa.177.3.6.