Serdar, B., W. J. Hayden, & S. Terzioglu.  2008.  Wood anatomy of Flueggea anatolica (Phyllanthaceae).  IAWA Jour. 29: 303-310.

Terry*, M. A., & W. J. Hayden.  2007.  Vascular Flora of Powhatan County, Virginia.  Castanea 72: 138-158.

Terry, M., & Hayden, W.J. (2005) Vascular Plant Inventory of Powhatan County, Virginia. Virginia Journal of Science, 56.

Callaghan, J. A., & Hayden, W.J. (2004)  The Helen Moyers Biocultural Reserve at Rancho Kiuic, Yucatan, Mexico: An Introduction to the Reserve and its Flora. Botany 2004 Scientific Meeting Abstracts, #663, p.169.

Kelly*, J., & W. J. Hayden.  2012.  Apomixis in a pistillate clone of Flueggea suffruticosa (Phyllanthaceae).  Paper presented at the annual meeting of the Virginia Academy of Science.  Abstract: Va. J. Sci. 63: (in press).

Hayden, W. J. & M. J. Drake*.  2010.  Structure of foliar glands of Stizophyllum riparium (Bignoniaceae).  Paper presented at the Botany 2010 annual meeting.  http://2010.botanyconference.org/engine/search/index.php?func=detail&aid=350

Hayden, W. J.  2010. Flower and inflorescence structure in Dorstenia (Moraceae): an undergraduate discovery science project.  Paper presented at the annual meeting of the Virginia Academy of Science.  Abstract: Va. J. Sci. 61: 32-33.

Hayden, W. J.  2010.  An introduction to the Cape Floristic Province.  Paper presented at the annual meeting of the Virginia Academy of Science.  Abstract: Va. J. Sci. 61: 32.

Drake*, M. J. & W. J. Hayden.  2010.  Structure of foliar glands of Stizophyllum riparium (Bignoniaceae).  Paper presented at the annual meeting of the Virginia Academy of Science.  Abstract: Va. J. Sci. 61: 31.

Miller*, P. E., & W. J. Hayden.  2009.  Preliminary studies of floral anatomy of Physalis (Solanaceae).  Paper presented at the annual meeting of the Virginia Academy of Science.  Abstract: Va. J. Sci. 60: 75.

Hayden, W. J.  2005 and onwards.  Flora of Kaxil Kiuic.  http://oncampus.richmond.edu/ academics/flora-kiuic/index-kiuic%20checklist.html (Last update: 5 January 2010)

Kostadinov, T., Hayden, S.M., & Hayden, W.J. (2004) Secondary Xylem of Dalechampia (Euphorbiaceae). Virginia Journal of Science, 55: 33-34.

Kostadinov, T., Hayden, S.M., & Hayden, W.J. (2003)  Correcting the Record: Wood of Dalechampia (Euphorbiaceae Subfamily Acalyphoideae) Lacks Laticifers. International Association of Wood Anatomists Journal, July 2003.