United States, Illinois, Rock Island Co., Davenport E 7.5 minute quadrangle; Rock Island; just NW of Quad Cities Botanical Center, N of 4th Avenue; just S of Sylvan Slough of the Mississippi River. T18N, RW, Sec. 36 S½, NW½.
41.5094 -90.5786
177 meters
580 ft
Fill gravel and soil; mostly calcareous; weeds along railraod.