This Atlas treats most of the native vascular plants of grassland and savanna communities from the standpoints of floristics and phytogeography. Included are 341 species and 73 additional subspecies, varieties, and hybrids, as well as 103 species and 50 infraspecific taxa and hybrids.

Part I (available online) discusses the physical geography and climate of Wisconsin; the composition of its prairie, barrens, and savanna communities; and the history of its flora.

Part II (not available) consists of 354 dot maps showing the exact distributions of the taxa, each accompanied by a statement describing the plant’s habitats, abundance, overall distribution, and geo-floristic affinities. One of the practical uses of this work is to help guide ecologists and conservationists in the planning of prairie restorations.