BioStor
 | Additions to the flora of Washington and vicinity, from April 1, 1884 to April 1, 1886 F H Knowlton (1886) Proceedings of The Biological Society of Washington 3: 106-132 |
 | Third Ust of additions to the flora of Washington, D.C T Holm (1892) Proceedings of The Biological Society of Washington 7: 105-132 |
 | Fourth list of additions to the flora of Washington, D.C T Holm (1896) Proceedings of The Biological Society of Washington 10: 29-43 |
 | La fauna de la Republica Argentina. E L Holmberg (1898) Segundo censo nacional : 477-602 |
 | Sixth list of additions to the flora of Washington, D.C. vicinity. With descriptions of new species varieties by Edward L. Greene, Alvah A. Eaton, and the author E S Steele (1901) Proceedings of The Biological Society of Washington 14: 47-86 |