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• OVERVIEW <br />Appendix 4.4-B contains descriptions of the plant species that may be used in <br />revegetating the disturbed lands at the Edna Mine. The evaluations of the species were <br />derived for the most part from the Western Energy Land Use Team's ("WELUT") Plant <br />Information Network ("PIN") data base and mine Bite experience with many of the species <br />in question. This appendix contains a listing of definitions for the various attributes used <br />in PIN, followed by descriptions of the species. The plant species descriptions are grouped <br />into habits, including Grasses. Forbs and T4ees and Shrubs. <br />A. Weedy - A plant considered undesirable or troublesome, especially one that is growing <br />where it is not wanted. Plants are scored in P.I.N. only once in the following order: 1. <br />Noxious, 2. Economic, 3. Colonizing and 4. Non-weedy. <br />1. Noxious - A plant which is listed on official noxious weed seed lists of Colorado, <br />Montana, North Dakota or Wyoming. <br />• 2. Economic - A plant whose growth and reproduction causes economic loss. <br />3. Colonizine - A plant which has attributes enabling it to become easily established <br />in areas of environmental disturbance or where it is not wanted. <br />4. Non-weedy - Not a weed. <br />B. Poisonous -Livestock -Plants that contain or produce, under natural conditions, phys- <br />. iologically active or toxic substances in sufficient amounts to cause harmful effects in <br />livestock, or produce mechanically injurious plant parts. <br />Plants are included in only one category in the following order of description prece- <br />dence. <br />1. ~gjp= - A plant that typically produces substances of high toxicity, may be highly or <br />moderately palatable, and is usually available in its range. This category in- <br />cludes plants that often accumulate selenium or molybdenum or nitrates to toxic <br />levels. Plants in this category cause the majority of livestock losses. <br />2. apt - A plant that produces substances of low toxicity and/or rarely produces <br />substances of high toxicity, and/or has low palatability, and/or is usually unavail- <br />able or rare in its range. This category includes plants that are secondary sele- <br />• nium or molybdenum accumulators. It should be noted that also included in this <br />category are legumes, crop plants and other species of significant economic value <br />4.4-B-I <br />