Coefficient of Conservatism:
Coefficient of Wetness:
B. S. Walters
On rock at Isle Royale and in Dickinson, Marquette, and Keweenaw Cos. (including a very blue-glaucous form on Mt. Bohemia) and on dolomite pavement on Summer Island (Delta Co.) and Drummond Island (Chippewa Co.); elsewhere almost entirely confined to the sandy or gravelly shores and dunes of the Great Lakes, usually associated with pine and the common juniper, and relic on older shores and beach ridges among cedar and fir thickets; rare in peatlands in the Upper Peninsula.
Often cultivated, and some southern collections on roadsides and near buildings inland from the Great Lakes shores are not mapped as they were presumably planted. This includes specimens from Crawford, Ogemaw, Oscoda, and Van Buren Cos. The somewhat disjunct occurrence in Tuscola Co. is from an open beach ridge of Lake Huron and is apparently native.