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• 5.0 REFERENCES CITED <br />Beetle, A. A. 1970. Recommended plant names. University of Wyoming Ag. <br />Exp. Station Res. J. 31. Laramie. <br />Colorado Natural Heritage Inventory. 1983. Plant species of special concern. <br />Colorado Department of Natural Resources, Natural Areas Program, Denver, <br />Kuchler, A. W. 1966. Potential natural vegetation of the conterminous United <br />States. American Geographical Society, New York. <br />Mueller-Dombois, D. and H. Ellenberg. 1974. Aims and methods of vegetation <br />ecology. John Wiley and Sons, New York. <br />Nickerson, M. R., G. E. Brink, and C. Feddema. 1976. Principal range plants <br />of the central and southern Rocky Mountains: names and symbols. USDA <br />Forest Service Gen. Tech. Rept. RM-20, Rocky Mountain Forest and Range <br />Exper. Sta., Fort Collins. <br />Shelford, V. E. 1963. The ecology of North America. University of Illinois <br />Press, Urbana. <br />Thornton, B. J., H. D. Harrington, and R. L. Zimdahl. 1974. Weeds of Colorado. <br />Colorado State University Agric. Exper. Sta., Bulletin 514-5 (revised). <br />• Fort Collins. <br />U.S. Department of Agriculture. 1963 and 1975. Soil Conservation Service. <br />Range Site Descriptions 288 (Rocky Foothills) and 284 (Loamy Foothills) - <br />Southern Rocky Mountains Land Resource Area. <br />U.S. Fish and Wildlife Service. 1980. Review of plant taxa for listing as <br />threatened or endangered species. Federal Register 45(2421:82480-82569. <br />Weber, W. A. and B. C. Johnston. 1979. Natural history inventory of Colorado. <br />1. vascular plants, lichens, and bryophytes. University of Colorado <br />Museum, Boulder, <br /> <br />_22_ <br />