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1 <br />' 6.0 RERERENCES CITED <br />I <br />Beetle, A. P. 1970. Recommended plant rames. University of Wyoming Ag. <br />Exp. Station Res. J. 31. Laramie. <br />~ Colorado Natural Heritage Inventory. 1983. Plant species of special <br /> concern. Colorado Department of Natural Resources, Natural Areas <br /> Program, Denver. <br /> Kiichler, A. W. 1966. Potential natural vegetation of the conterminous <br />' United States. American Geographical Society, New York. <br /> Mueller-Dombois, D. and H. Ellenberg. 1974. Aims and methotls of vegeta- <br /> tion ecology. John Wiley and °ons, New York. <br />' i <br /> N <br />ckerson, M. R., G. E. Brink, and C. Feddema. 1976. Principal range <br /> plants of the central antl soutt~err~ Rocky Mountains: names and <br /> symbols. USDA Forest Service Gen. Tech. Report RM-20, Rocky Moun- <br />' tain Forest and Range Exper. Sta., Fort Collins. <br /> Shelford, V. E. 1963. The ecology of North America. University of <br />' Illinois Press, Urbane,. <br /> Thornton, 8. J., H. D. Harrington, and R. L. Zimdahl. 1974. Weeds of <br /> Colorado. Colorado State University Agric. Exper. Sta., Bulletin <br />' 514-5 Irevisedl. Fort Collins. <br />' U.S. Fish and Wildlife Service. 1980. Review of plant taxa for listing <br />as threatened or endangered species. Federal Register 4512421: <br /> 82480-82569. <br />' Weber, W. A. and E. C. Johnston. 1979. Natural historl inventory of <br /> Colorado. I. vascular plants, lichens, and bryophytes. University <br /> of Colorado Museum, Boulder. <br />1 <br />1 <br />1 <br /> <br /> <br /> <br />' -51- <br />