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LITERATURE CITED <br />• <br />Colorado Natural Heritage Inventory. 1980. Candidate plant species of <br />special concern. Colorado Department of Natural Resources, Natural <br />Areas Program, Denver. <br />Harrington, H. D. 1964. Manual of the plants of Colorado. Sage Books, <br />Denver. <br />U.S. Bureau of Land Management (BLMI. 1981. Threatened, endangered, and <br />sensitive plant species policy and list for Colorado. Instruction <br />Memorandum No. C081-291, Denver. <br />U.S. Fish and Wildlife Service IUSFWS). 1980. Review of plant taxa for <br />listing as threatened or endangered species. Federal Register 45(2421: <br />82480-82569. <br />U. S. Forest Service. 1980. Proposed and recommended threatened and <br />endangered plant species of the Forest Service Rocky Mountain Region, <br />USDA (FSI, Lakewood, Colorado. <br />Weber, W. A. 1976. Rocky Mountain flora. Colorado Assoc. University Press, <br />Boulder. <br />• Welsh, 5. L. 1978. Endangered and threatened pants of Utah; a re-evaluation. <br />Great Basin Naturalist 38(1):1-18. <br /> <br />-4- <br />