Grings, Martin, IlSI IOB BOLDRINI, ALBERTO KNOB, and SÉRGIO AUGUSTO DE LORETO BORDIGNON. 2014. “A New Species of <em>Calyculogygas</Em> (Malvaceae) from Southern Brazil”. Phytotaxa 178 (1):43–49. https://doi.org/10.11646/phytotaxa.178.1.5.