The Wartburg College herbarium (established in 1930) includes specimens from nearly 560 genera in 145 families. Just over 82% of the entire herbarium was collected in Iowa and nearly 70% of the Iowan specimens were collected in Bremer county (home to Wartburg College). Together the Asteraceae, Fabaceae, Poaceae, and Rosaceae comprise just over one-fourth of the entire collection. The collections of Craig C. Freeman, Fred H. Hubbard, Steve A. Main, and J.A. Woltz comprise nearly 32% of the entire herbarium.