Sauganash Prairie Grove is a mix of wet savanna, degraded marsh, and mature floodplain woods on both sides of the Chicago River. This uncommon woodland community is dominated by swamp white oaks. Plants such as swamp saxifrage, blue flag iris, and bluejoint grass are indicators the wetness of this site. In the more mesic woodland along the river bluff, one finds plants with such picturesqe names as zig-zag goldenrod, wild geranium, wood reed, bottlebrush grass and golden alexanders.