KARIS, P. O.; MCKENZIE, R. J. Second-step lectotypification of Stobaea rigida and reassessment of heterotypic synonyms of Berkheya rigida (Asteraceae, Arctotideae). Phytotaxa, Auckland, New Zealand, v. 641, n. 4, p. 267–276, 2024. DOI: 10.11646/phytotaxa.641.4.3. Disponível em: https://phytotaxa.mapress.com/pt/article/view/phytotaxa.641.4.3. Acesso em: 6 dec. 2025.