BioStor
 | The genera of Olacaceae in the southeastern United States K R Robertson (1982) Journal of the Arnold Arboretum 63: 387-399 |
 | A Study of the Vegetation and Floristic Affinity of the Limestone Forests in Southern and Southwestern China Xu Zhaoran (1995) Annals of the Missouri Botanical Garden 82: 570-580 |
 | New species of Cyclanthaceae from southern Central America and northern South America B E Hammel (2003) Novon 13: 52-63 |