MAGEE, A. R.; BOATWRIGHT, J. S.; MUCINA, L. Four new species of Ursinia (Asteraceae, Anthemideae) from South Africa, with an updated key to the genus in Namaqualand. Phytotaxa, Auckland, New Zealand, v. 177, n. 3, p. 137–145, 2014. DOI: 10.11646/phytotaxa.177.3.1. Disponível em: https://phytotaxa.mapress.com/pt/article/view/phytotaxa.177.3.1. Acesso em: 6 dec. 2025.