WILLIAMS, Norris H. POLLEN STRUCTURE AND THE SYSTEMATICS OF THE NEOTROPICAL GESNERIACEAE. Selbyana, [S. l.], v. 2, n. 2/3, p. 310–322, 1978. Disponível em: https://journals.flvc.org/selbyana/article/view/120419. Acesso em: 6 mar. 2026.