BioStor
 | On the volcano of Taal J E Tenison-Woods (1888) Proceedings of the Linnean Society of New South Wales 2: 685-810 |
 | The genera of Berberidaceae, Lardizabalaceae, and Menispermaceae in the southeastern United States W R Ernst (1964) Journal of the Arnold Arboretum 45: 1-35 |