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Midwest Natural Resources,Inc.-Trott Brook-Rare Plant Survey Report-Anoka County,Minnesota
<br /> Wetlands are present in both the northern and southern portions of the site. The northern wetland area is a
<br /> mosaic of intact native plant community and invasive cattail (Typha sp.). Intact portions of this complex
<br /> are dominated by wiregrass sedge (Carex lasiocarpa), Canada rush(Juncus canadensis), and broad-leaved
<br /> arrowhead(Sagittaria latifolia).
<br /> The southern wetland complex adjacent to Trott Brook is strongly influenced by groundwater discharge.
<br /> This specific area corresponds to the Peat and muck map unit depicted in the Surficial Geology map. The
<br /> wetland itself is intact and floristically diverse with both wet forest and wet meadow communities. This
<br /> complex includes an open graminoid-dominated community with obvious groundwater discharge and
<br /> dome-like topography. This area is bordered to the north by wet forest containing black ash (Fraxinus
<br /> nigra),tamarack(Larix laricina),and a wall of non-native cattail. Species of note include bog birch(Betula
<br /> pumila),fringed brome(Bromus ciliatus),spring cress(Cardamine bulbosa),water sedge(Carex aquatilis),
<br /> porcupine sedge (Carex hystericina), interior sedge (Carex interior), prairie sedge (Carex prairea), sage-
<br /> leaved willow(Salix candida) and bog aster(Symphyotrichum boreale). The species list for this collective
<br /> community is presented in Appendix C. Other noteworthy species include marsh stitchwort (Stellaria
<br /> palustris) and the native broad-leaved cattail (Typha latifolia). The marsh stitchwort is identified as an
<br /> introduced species from northern Europe.However,the this is the second known occurrence of this species
<br /> in the state that we are aware of. Both populations are present in discharge systems including a rich fen
<br /> community in northern Minnesota and now this population. The broad-leaved cattail is sporadically
<br /> distributed within the feature in contrast to the aforementioned wall of non-native cattail.It is either an issue
<br /> of time or a combination of factors (soils, hydrology, and chemistry) that is currently inhibiting the non-
<br /> native cattails from taking over this system.
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<br /> Photo of open graminoid-dominated discharge feature with tamarack in the background.
<br /> Although it would be unusual and unexpected for this area, the mentioned assemblage of plants is
<br /> suggestive of possible calcareous fen conditions. If using the calciphile species occurrence method in Leete
<br /> and Smith(2005),this location(Minnesota River Valley Region)would have a point total of 65.The critical
<br /> Vegetation Criterion threshold for calcareous fens is 50 points.However,key calciphile species, other than
<br /> the prairie sedge, appear to be absent. Soils were evaluated on the second site visit in an attempt to collect
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