PAIVA, J.; FIGUEIREDO, E.; SMITH, G. F. Polygala retiefiana (Polygalaceae), a new species described from South Africa. Phytotaxa, Auckland, New Zealand, v. 117, n. 1, p. 30–34, 2013. DOI: 10.11646/phytotaxa.117.1.4. Disponível em: https://phytotaxa.mapress.com/pt/article/view/phytotaxa.117.1.4. Acesso em: 6 dec. 2025.