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4 - 62 <br />• Succulents are scattered throughout this vegetation type although they contribute little to <br />total cover. Plains prickly pear, Opunita polyancantha is the most common. <br />PRODUCTION <br />The estimated production of clipped plots in the Greasewood Shrubland ranges from 48.2 <br />g/m2 to 239.0 g/mZ and averages 100.3 g/mZ or 894 pounds per acre. Graminoid production <br />accounts for over half of the total biomass (59.9 g/m2, 60 percent of the total produced). The <br />major graminoid producer is cheatgrass (44.8 g/m2). Western wheatgrass is also an important <br />graminoid, producing 13.3 g/m2. See Table 4.5-3. <br />DENSITY <br />Greasewood is the most common shrub in this community with density of 0.4 shrubs per <br />square meter (1,569 shrubs per acre) followed by seepweed (523 shrubs per acre), big <br />sagebrush (496 shrubs per acre), mountain pepperweed, Lepidium montanum (a sub shrub, <br />468 plants per acre), and rubber rabbitbrush (248 shrubs per acre). Average height for all <br />shrubs is 95 centimeters and the average height is 114 centimeters. See Table 4.5.4. <br />RICHNESS AND EQUITABILITY <br />• Richness of species is the number of species occurring in a sample or an area. The <br />equitability index refers to the relative similarity of cover values or the evenness of cover <br />distribution among the species found in the Greasewood Shrubland and the Juniper Woodland. <br />Seventeen species were found on seventeen transects. Equitability or the evenness of cover <br />distribution was low pndex = 0.75) because of the strong dominance of greasewood and <br />cheatgrass. See Table 4.5.5. <br /> <br />Nlo Volume 1 429-96 <br />