James Horn

James Horn

Herbarium Curator & Lecturer

MAC 147

Jay Horn is the curator of the Gary A. Fewless Herbarium and an instructor in UWGB’s Department of Natural and Applied Sciences. He grew up in the greater Chicago area, and on family vacations to northern Wisconsin he developed a strong interest in botanical diversity whilst exploring the forests and bogs of Vilas County. Having prevailed against being eaten alive by mosquitos in Wisconsin, Jay went on to earn a B.S. in Plant Science from Cornell University and an M.S. degree from the University of North Carolina at Chapel Hill. His dissertation research at Duke University focused on the molecular systematics and evolution of the phylogenetically key flowering plant family Dilleniaceae. Jay’s interest in developing and using herbaria began at Duke, stemming from many collecting trips throughout the southeastern U.S. and fieldwork in Australia and New Caledonia. After life in North Carolina, Jay was a postdoctoral researcher at Fairchild Tropical Botanic Garden, where he worked on a project culminating with the publication of the book The Anatomy of Palms. Prior to his arrival in Green Bay, Jay was a postdoctoral fellow in the Department of Botany at the Smithsonian’s National Museum of Natural History. His current research centers on molecular phylogenetics and evolution of flowering plants, particularly Euphorbia (containing spurges and poinsettia), Malvales (containing hibiscus, cacao, and meranti timber trees) and Dilleniaceae (obscure to most). Jay particularly likes using phylogenies to understand the tempo and processes of lineage diversification in these groups, along with discovering the evolutionary histories of structural and physiological traits. At UWGB, he will be teaching Field Botany and a yet-to-be-determined range of other plant and organismal biology courses.


Gary A. Fewless Herbarium

Research Interests

Phylogenetic systematics of flowering plants Dilleniales, Malpighiales, Malvales) and plant anatomy.


B.S. Cornell University; M.S. University of North Carolina-Chapel Hill; Ph.D. Duke University