BioStor
 | The marine and fresh-water sponges of California M W De Laubenfels (1932) Proceedings of the United States National Museum 81: 1-140 |
 | The genera of Caesalpinioideae (Leguminosae) in the southeastern United States Y T Lee and K R Robertson (1976) Journal of the Arnold Arboretum 57: 1-53 |