BioStor
 | Report on the flora of western and southern Texas V Havard (1885) Proceedings of The United States National Museum 8: 449-533 |
 | The known geographic distribution of the members of t he Verbenaceae and Avicenniaceae. Supplement 6 H N Moldenke (1947) Phytologia 2: 325-348 |
 | Notes on new and noteworthy plants. CIX H N Moldenke (1978) Phytologia 38: 498-499 |
 | Notes on the genus Tetraclea (Verbenaceae) H N Moldenke (1981) Phytologia 48: 397-413 |
 | Vascular flora of Buenos Aires National Wildlife Refuge (including Arivaca Cienega), Pima County, Arizona S P Mclaughlin (1992) Phytologia 73: 353-377 |