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Grings, M., Boldrini, I.I., Knob, A. and Bordignon, S.A.D.L. 2014. A new species of Calyculogygas (Malvaceae) from southern Brazil. Phytotaxa. 178, 1 (Sep. 2014), 43–49. DOI:https://doi.org/10.11646/phytotaxa.178.1.5.