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<br />The M_ 4xx modifiers represent invasive plant species occurring within land cover <br />polygons. For the purpose of this project, the percent cover of each species of interest <br />was estimated. These species are important to have information about due to their <br />invasive nature and potential threats to native plant communities and biological <br />diversity of native habitats. The cover classes used to assess invasive species aerial <br />cover (i.e. as viewed from above) is a follows: <br /> <br />Cover Class/Estimated Percent Cover for Invasive Species <br /> <br />Cover Class Description <br />0 Unknown, or if field checked, <br /> plants not observed <br />1 Observed, unknown quantity <br />2 1 - 5% Coverage <br />3 6 - 25% Coverage <br />4 26 - 50% Coverage <br />5 51 - 75% Coverage <br />6 76 - 100% Coverage <br /> <br />The following is a list of invasive plant species modifier numbers. Where these may <br /> <br />have been encountered, they were recorded for aerial coverage within land cover <br /> <br />polygons: <br />400 - Overgrown prairie/savanna <br />401 - Overgrown woodland <br />402 - Purple loosestrife <br />403 - Eurasion watermilfoil <br />404 - Curly-leafed pondweed <br />405 - Flowering rush <br />406 - Narrow-leaf cattail <br />407 - Crown vetch <br />408 - Common and glossy buckthorn <br />409 - Leafy spurge <br />410 - Tartarian honey suckle <br />411 - Garlic mustard <br />412 - Reed canary grass <br />413 - Smooth brome <br />414 - Spotted knapweed <br /> <br />. http://files.dnrstate.mn.us!ecoloqical servlces!nhnrp/eoranks2001.pdfp/eoranks2001.pdf <br /> <br />City of Elk River, MN - Natural Resouce Inventory <br />Bonestroo Natural Resources, September 2004 <br /> <br />12 <br />