Hugh Iltis

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Hugh Iltis was a Czech-born American botanist and a longtime professor at the University of Wisconsin–Madison, where he directed the herbarium and taught plant geography, taxonomy, and grass systematics. He is best known for his work on the origins of maize and for his strong advocacy for the environment.

Early life and education
Hugh Iltis was born Hugo Hellmut Iltis on April 7, 1925, in Brno (then Czechoslovakia). His family fled the Nazi regime, eventually settling in the United States. The family settled in Fredericksburg, Virginia, where Hugo later shortened his name to Hugh. He studied botany at the University of Tennessee and served in the U.S. Army from 1944 to 1946. After the war, he continued his studies and earned a Ph.D. in 1952 from Washington University in St. Louis, working under Edgar Anderson.

Academic career
Iltis began his teaching career at the University of Arkansas (1952–1955) before moving to the University of Wisconsin–Madison in 1955. At Madison, he directed the university’s herbarium, taught courses on geography and taxonomy, and helped acquire the Catholic University of America herbarium. He mentored many graduate students and, with his colleagues, collected thousands of plant specimens across the Midwest. He helped produce the Atlas of the Wisconsin Prairie and Savanna Flora (2000) with Theodore Cochrane.

Scientific contributions
Iltis is famous for his role in the discovery of perennial teosinte, Zea diploperennis, a wild relative of modern corn. In 1962, during a field trip to Peru, he observed a small flower that would later be identified as a new teosinte species; in 1978, he led a team that confirmed the existence of Zea diploperennis. His work supported the view that domestic corn arose from wild teosintes. On the same expedition, he recorded a wild tomato with higher sugar content that was later used to improve cultivated tomatoes through breeding. He also conducted extensive studies in plant systematics, particularly on the Capparaceae and Cleomaceae families.

Environmental activism
Iltis was a prominent environmentalist. He helped found the Wisconsin chapter of the Nature Conservancy in 1960, promoted the protection of habitats, and campaigned to preserve the Sierra de Manantlán Biosphere Reserve in Mexico. He played a key role in Wisconsin’s ban on DDT in 1968 and advocated for the protection of virgin timber. He supported broader ecological reform and urged society to adopt sustainable practices.

Personal life and legacy
Iltis and his partners supported education and fieldwork; with Carolyn Merchant, he endowed a fund at UW–Madison to support graduate fieldwork in plant systematics. He fathered four sons and remained active in science and conservation until his death. He passed away on December 19, 2016, in Madison, Wisconsin, at age 91. His work lives on in the many plant species named in his honor, his influential publications, and the ongoing conservation efforts he helped inspire.

Honors
Iltis received several awards for his work, including the Asa Gray Award (1994) and the Merit Award from the Botanical Society of America (1996). He was honored internationally for his conservation efforts and received recognitions from universities in Mexico. In 2017, he was posthumously inducted into the Wisconsin Conservation Hall of Fame.