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2.0 METHODS <br />• <br />Our approach consisted of (11 identifying plants of federal and state concern; <br />121 reviewing the literature and talking with knowledgeable professionals to <br />determine which of these species could be potentially present; and 131 con- <br />ducting a field survey to verify the presence/absence of the species of <br />interest. <br />2.1 PLANT SPECIES OF FEDERAL AND STATE CONCERN <br />Plant species of federal concern include three categories of listings <br />by the U.S. Fish and Wildlife Service (19801. They include: <br />111 taxa currently listed as threatened or endangered <br />121 taxa currently proposed for threatened or endangered status <br />(31 taxa currently under review for threatened or endangered status <br />Another tabulation of plants of federal concern included "Sensitive <br />Plant Species in the Grand Junction Resource Area" as listed by the Bureau <br />of Land Management in Memo N81-291 dated 14 August 1981. Finally, the U.S. <br />Forest Service's "Proposed and Recommended Threatened and Endangered Plant <br />Species of the Forest Service. Rocky Mountain Region" was reviewed to further <br />• refine the list of federal plants. <br />"Plant Species of Special Concern" for Colorado included those listed <br />by the Colorado Natural Heritage Inventory, Colorado Department of Natural <br />Resources in a memo dated 10 January 1983. <br />2.2 LITERATURE REVIEW/KNOWLEDGEABLE PERSONNEL CONTACT <br />The habitat affinities and geographic range as published in Harrington <br />11964), Welsh (19781, Cronquist et al. (19721, and the U.S. Forest Service <br />(19801 was reviewed to determine plant species of the above lists potentially <br />present in the avid to semi-arid vegetation types of the study area. <br />The list was further refined through conversations with Dr. William A. <br />Weber, Curator of the Herbarium, University of Colorado; Robert Smith, U. S. <br />Fish and Wildlife Service; and Ron Lambeth, Bureau of Land Management. <br />2.3 FIELD SURVEY <br />Prior to field activities the ecologic and taxonomic characteristics of <br />the plant species of interest was thoroughly reviewed. Areas surveyed in <br />the field included the three study areas and sites to be disturbed in the <br />• near future. A plant ecologist systematically walked the entire area <br />traversing the area of interest in straight lines approximately 50 feet apart. <br />-2- <br />