BioStor
 | Studies in Neotropical Senecioneae. II. Transfers to genus Pentacalia of North Andean species J Cuatrecasas (1981) Phytologia 49: 241-260 |
 | Oresbia, a new South African genus in the Asteraceae, Senecioneae Rune Nordenstam and Glynis Cron (2006) Novon 16: 216-223 |