The vascular plants occurring within an acidic black spruce bog and its surrounding moat in southeastern Wisconsin are listed with observational notes on abundance and habitat. Of the 156 species, at least 20 are at or near the southern extent of their range, and four are currently State designated species of Special Concern.
Kline, J. 1991. Vascular plants of the Sapa Bog. Field Station Bulletin 24(1): 1-13.