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<br />REFERENCES CITED <br />Colorado Natural Heritage Inventory. 1983. Candidate plant species <br />of special concern. Colorado Department of Natural Resources, <br />Natural Areas Program, Denver. <br />Mueller-Dombois, D. and H. Ellenberg. 1974. Aims and methods of vegetation <br />ecology. John [Jiley b Sons, New York. <br />Thornton, B. J., H. D. Harrington, and R. L. Zimdahl. 1974. Weeds <br />of Colorado. Colorado State University Experimental Station, <br />Ft. Collins, Colorado. <br />U.S. Fish and Wildlife Service (USFWS). 1980. Review of plant taxa for <br />listing as endangered or threatened species. Federal Register <br />45(242):82480-82569 <br />U.S. Fish and Iildlife Service (USFIJS). 1983. Supplement to review of <br />plant taxa for listing. Federal Register 48(229):53640-53670. <br />Weber, W. A. and B. C. Johnston. 1979. Natural history inventory of <br />Colorado. I. vascular plants, lichens, and bryophytes. University <br />of Colorado Museum, University of Colorado, boulder. <br />-6- <br />