United States, Minnesota, Lake, Lake Superior, ca. 6 mi. N. of Duluth along North Shore; Knife River harbor
46.946436 -91.780584 +-411m. WGS84
rocky basaltic rock island; vegetation hindered by birds and elements
shallow soil
voucher specimen: see Bernard, J.M., D.W. Davidson, and R.G. Koch Ecology and Floristics of Knife Island, a Gull Rookery on Lake Superior. J. Minn. Acad. Sci. 37(2-3):101-103. 1971