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Mountain Brush and Sagebrush References Area native species density of 28.7 and 27.7 species per 100 m2, respectively, was up from the figures in 1990 of 22.9 and 25.9 native species per 100 m2, respectively. Last years (1990) reference area data were actually approached in native species density by several reclaimed areas sampled in 1990, in which the highest native species densities were 18.9, 16.3, and 16.2 native species per 100 m2. These levels are very comparable to those found in 1991 in the highest two areas (18.3 and 15.6 native species per 100 m2 in the 1984 end 1987 Wolf Creek areas). However, in 1991 the reference areas both increased by several species per 100 m2, so that in 1991 the comparison is no longer so close. Though no reclaimed area exceeded both reference areas, total species density in the 1987 Woli Creek area exceeded the Sagebrush (but not the Mountain Brush) Reference Area . Annual and biennial (orbs were, as usual, most diverse in the youngest reclamation areas (1987 Wolf Creek, 1989 Wadge and 1989 Wolf Creek); this was true for introduced annuals and biennials, but not for native annuals and biennials. The level of native annual and biennial torbs present in reclaimed areas was for the most part slightly above the range observed in • the reference area sampling, while introduced annual and biennial (orbs densities in the reclaimed areas always exceed those of the reference areas. Introduced perennial forb species were rather uniformly present at 1.9 to 2.9 species per 100 m2, except in the 1989 Wadge area which had 0.9 species per 100 m2. In the reference areas, introduced perennial (orbs were less than one species per 100 m2. Native perennial forb density was greatest in the 1984 and 1987 Wolf Creek areas and 1987 Wadge (8.7, 9.2, and 6.3 species per 100 m2, respectively). These figures compared to 17.1 and 15.4 species per 100 m2 in the Mountain Brush and Sagebrush reference areas, respectively. Wadge Pasture was observed in 1991 to have 4.7 native perennial forb species per 100 m2, compared to 4.8 species per 100 m2 in 199 0. Total species density o1 perennial graminoids (introduced and native) in the Mountain Brush and Sagebrush Reference Areas was 5.5 and 7.5 species per 100 m2 ,respectively, in 1991, compared to 3.9 and 6.4 species per 100 m2, respectively, in 1990. The Mountain Brush level is exceeded in all reclaimed areas. Species density of perennial graminoids in the Sagebrush Reference Area was equalled or exceeded by all reclaimed areas, except the 1989 Wolf Creek area. Shrub species density in the Mountain Brush and Sagebrush Reference Areas r~ L_J 10