Spring Flora of Wisconsin: A Manual of Plants Growing without Cultivation and Flowering Before June 15
This is another book that Sam recommends for people interested in Ecoculture.
Norman C. Fassett was professor of botany and curator of the Herbarium at the University of Wisconsin from 1925 to 1954. He was a pioneer in preserving habitat of the rich and diverse flora of Wisconsin. He is also the author ofGrasses of Wisconsin and A Manual of Aquatic Plants, both published by the University of Wisconsin Press.