BioStor
 | New combinations in Potentilla and Horkelia (Rosaceae) in California B Ertter Phytologia 71: 420-422 |
 | Descriptions of new plants from southern California, Nevada, Utah, and Arizona F V Coville (1892) Proceedings of The Biological Society of Washington 7: 65-80 |
 | A new cave spider from North Carolina (1950) Proceedings of The Biological Society of Washington 63: 9-12 |
 | The genera of Rosaceae in the southeastern United States [cont.] K R Robertson (1974) Journal of the Arnold Arboretum 55: 344-401 |
 | New sections, combinations, and varieties in Rosaceae, Potentilleae James Lauritz Reveal and Barbara Ertter (2007) Novon 17: 315-325 |