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-100- <br /> <br />climax tree species are replaced by stands of subclimax Lodgepole Pine <br />(Pinus contorta), Aspen, or Douglas Fir (Pseudotsuga menziesii) at lower <br />elevations within this belt. There is no sharp boundary between the <br />sub alpine and montane life belts. <br />In the forested montane life zone the dominant tree species <br />are White Fir (Abies concolor), Western Yellow Pine (Pinus ponderosa), <br />and Douglas Fir. The Western Yellow Pine is found on dry more exposed <br />slopes while Douglas Fir occurs on more moist, sheltered and higher <br />altitude slopes. <br />Limber Pine (Pinus flexi'_is) and Aspen are also often present. <br />Limber Piae is usually associated with exposed rocky sites. The pines <br />'"' tend to form relatively open forests that become savannah-like with <br />decreasing altitude and there is commonly an understory of Big Sagebrush <br />(Artemisia tridentata) and Bitterbrush (Purshia tridentata). <br />Shrubs such as Mountain Mahogany and scrub oak species also <br />occur on dry rocky slopes in this region. In the southern part of the <br />Coloradan province, where the Coloradan and Navahonian provinces meet <br />(New Mexico and Utah), depending upon slope exposure, either Yellow Piae <br />or Pinon-juniper associations occur. <br />Depending or. edanhic conditions such as mois[ure and soil <br />type, the extensive unforesced parks found in the Coloradan province are <br />dominated by grasses or sagebrush and other shrubs. <br />o u:.l.5 .~ `dUCRE <br />