BERGH, Nicola G.; HELME, Nick A. A new species of Berkheya (Asteraceae, Arctotideae) from the Northern Cape, South Africa. African Biodiversity & Conservation, [S. l.], v. 44, n. 1, 2014. Disponível em: https://mail.abcjournal.org/index.php/abc/article/view/177. Acesso em: 2 may. 2026.