BioStor
 | Mammals of Panama Edward A Goldman (1921) Smithsonian miscellaneous collections 69(5): 1-309 |
 | Expeditions of the California Academy of Sciences to the Gulf of California in 1921. The botany (the vascular plants) Ivan Murray Johnston (1924) Proceedings of the California Academy of Sciences 12: 951-1218 |
 | Studies in the flora of Lower California and adjacent islands Alice Eastwood (1929) Proceedings of the California Academy of Sciences 18: 393-484 |
 | The flora of the Revillagigedo Islands Ivan Murray Johnston (1931) Proceedings of the California Academy of Sciences 20: 9-104 |
 | Materials toward a monograph of the genus Verbena. II H N Moldenke (1961) Phytologia 8: 108-152 |
 | The Acanthaceae of California and the peninsula of Baja California Thomas F Daniel (1997) Proceedings of the California Academy of Sciences 49(10): 309-403 |