BioStor
 | A Flora of the chrome and manganese ore piles at Canton, in the Port of Baltimore, Maryland and at Newport News, Virginia, with descriptions C R Reed (1964) Phytologia 10: 321-406 |
 | Vascular flora of Buenos Aires National Wildlife Refuge (including Arivaca Cienega), Pima County, Arizona S P Mclaughlin (1992) Phytologia 73: 353-377 |