Key to Michigan's Natural Communities

A. Canopy strongly dominated by black spruce, frequently with tamarack, and occasionally with jack pine as codominants. Substrate extremely acid to very strongly acid, deep fibric peat. Sphagnum mosses dominant in ground layer. Ericaceous shrubs dominant to locally abundant including leatherleaf, Labrador tea, bog laurel (Kalmia polifolia), and in southern Lower Michigan, smooth highbush blueberry (Vaccinium corymbosum). Hydrology strongly influenced by precipitation (i.e., ombrotrophic) due to peat accumulation above groundwater table. Occurring mostly north of the climatic tension zone in depressions of glacial outwash, glacial lakeplains, ground moraine, and kettles in coarse-textured moraines and ice-contact topography .... Poor Conifer Swamp

B. Canopy strongly dominated by northern white-cedar or tamarack. .... Continue

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