SZELĄG, Z. <em>Hieracium umbellonigritum</em> (Asteraceae), a new hybridogenous species from the Sudetes in Poland. Phytotaxa, [S. l.], v. 589, n. 3, p. 289–292, 2023. DOI: 10.11646/phytotaxa.589.3.8. Disponível em: https://phytotaxa.mapress.com/pt/article/view/phytotaxa.589.3.8. Acesso em: 14 mar. 2025.