BioStor
 | Investigations in the natural history of Baja California Ira Loren Wiggins (1960) Proceedings of the California Academy of Sciences 30: 1-45 |
 | The genera of Capparaceae and Moringaceae in the southeastern United States W R Ernst (1963) Journal of the Arnold Arboretum 44: 81-95 |
 | A flora of the San Bruno Mountains San Mateo County, California Elizabeth Mcclintock and Neil Fahy (1968) Proceedings of the California Academy of Sciences 32: 587-677 |
 | A second species of Hunnemannia (Papaveraceae) and synopsis of the genus G L Nesom (1992) Phytologia 73: 330-337 |