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• 0.50 in most cases; lu~~hia t2iden.ta#o data showed such low coefficients of <br />determination that no estimations of production were attempted for that species. <br />Estimated shrub production figures for the Mountain Shrubland are pre- <br />sented in Table 24. Corresponding figures for the Pinyon-Juniper Woodland <br />are presented in Table 25. <br />3.5 PLANT SPECIES LIST <br />A total of 207 species of vascular plants were recorded in the permit <br />area. This is a relatively large number of species to occur in a xeric area. <br />It probably is a result of the varying slopes and exposures, as well as the <br />large areas of disturbed and reseeded areas supporting many weedy species. <br />The number of species by lifeform is as follows: trees--6, shrubs and sub- <br />shrubs--26, vines--2, succulents--7, perennial graminoids--35, annual <br />graminoids--2, perennial forbs--76, and annual forbs--53 (Table 261. <br />Approximately 15 percent, or 31 species, are introduced from outside the <br />geographic region. These consist primarily of annual forbs; however, some <br />areas have been seeded with introduced perennial grasses. Three species-- <br />Ci2~ium aaven.~e, Convovu.lu~ v2ver~ta, and L.irtaaio vuLga~i~--considered as <br />prohibited noxious weeds (highly detrimental and especially difficult to <br />control! occur in the permit area (Thornton et al. 1974). In addition, <br />• Lactuca #o#o~ica ssp. pinch e!.(o, a restricted noxious weed (very objectionable <br />but can be controlled) is found in the permit area. <br />3.6 THREATENED OR ENDANGERED SPECIES <br />Based on field observations in September 1982 and June and July 1983, no <br />plant species which are designated, proposed, or under review for possible <br />proposal as threatened or endangered by the U,S. Fish and Wildlife Service <br />(19801 are present in the permit area. Likewise, no species of "special <br />concern" as listed by the Colorado Natural Heritage Inventory were located. <br />A more detailed description of these species and their known localities was <br />supplied to CMLRD in July 1983. <br />3.7 SPECIES DIVERSITY <br />In terms of total species richness, the Caprock unit contains the smallest <br />number of vascular plant species contributing to cover. The Pinyon-Juniper <br />Woodland and the Mountain Shrubland have 41 and 42 species contributing to cover <br />data in 1983. By contrast, the Pinyon-Juniper Woodland Caprock phase is much <br />lower, with only 25 species contributing to vegetation cover. <br />Table 27 presents the number of species comprising over 3 percent relative <br />cover for each affected and reference area. Each species present is also <br />listed by lifeform. Comparison of affected and reference areas shows a high <br />• degree of similarity, with each reference area containing about 85 percent of <br />-17- <br />