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LITERATURE CITED <br /> Beetle, A. A. 1970. Recommended plant names. University of Wyoming <br /> Ag. Exp. Station R s. J. 31. Laramie. <br /> Mueller-Dombois D. and . Ellenber . <br /> g 1974. Aims and methods of <br /> ,r vegetation ecology. John Wiley and Sons, New York. <br /> Thornton, B. J. , H. D. Harrington, and R. L. Zimdahl . 1974. Weeds of <br /> Colorado. Colorado State University Agric. Exper. Sta. , Bulletin <br /> 514-S (revised) . Fort *Collins. <br /> Weber, W. A. and B. C. J�hnston. 1979. Natural history inventory of <br /> Colorado. I . Vascular plants, lichens, and bryophytes. Uni- <br /> versity of Colorado Museum, Boulder. <br /> Weber, W. A. 1976. Roc�Cy Mountain flora. Colorado Assoc. University <br /> Press, Boulder. <br /> Whittaker, R. R. 1970. Communities and ecosystems. (2nd ed. ) . <br /> MacMillan Publishing Co. , Inc. <br /> E <br />