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Pinus flexilis / Shrub Understory Central Rocky Mountain Woodland Alliance | NatureServe Biotics 2019
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Name: Pinus flexilis / Shrub Understory Central Rocky Mountain Woodland Alliance Reference: NatureServe Biotics 2019 Description: This foothill and outcrop woodland alliance occurs along the eastern slope of the central and northern Rocky Mountains and on escarpments in the northwestern Great Plains. Stands have an open canopy dominated by <i>Pinus flexilis</i> and may be codominated by <i>Juniperus scopulorum</i> or, less commonly, <i>Juniperus osteosperma</i>. The understory typically has an open to moderately dense shrub layer (10-40% cover). Shrubs such as <i>Amelanchier utahensis, Artemisia tridentata, Cercocarpus montanus, Purshia tridentata</i>, and <i>Rhus trilobata</i> are common. Total shrub cover is typically &gt;10%, but if less, then shrub cover exceeds herbaceous layer. The herbaceous layer is sparse to moderately dense and is composed primarily of graminoids such as <i>Achnatherum hymenoides, Bouteloua gracilis, Festuca campestris, Leucopoa kingii, Koeleria macrantha</i>, and <i>Pseudoroegneria spicata</i>. Scattered forbs may be present. Stands occur intermittently from lower montane and foothill zones in the central and northern Rocky Mountains, and on geographic breaks in the northwestern Great Plains. Elevations range from 850-2400 m. Sites are typically xeric on exposed, windswept rocky slopes and ridges. Some stands are on eroded substrates and resemble "badlands" while others may occur on lavaflows. These open woodlands occur on all aspects, but are most common on dry south- and west-facing slopes. Soils are typically shallow, skeletal and coarse-textured, such as gravelly, sandy loams or loams, but may include alkaline clays. Exposed bedrock is common and many stands have over 50% bare soil.  Accession Code: urn:lsid:vegbank.org:commConcept:38710-{F2EF787F-D806-4FC1-8F7A-A8592AB3A874} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 08-Jan-2014 to: ongoing
	status: accepted Community's Parent: Pinus flexilis - Juniperus scopulorum Rocky Mountain Foothill Woodland Group This Community's Level: Alliance This Community's Children: Show/Hide   Pinus flexilis / Cercocarpus montanus - Amelanchier utahensis Woodland   Pinus flexilis / Chamaebatiaria millefolium / Poa secunda Open Woodland   Pinus flexilis / Juniperus osteosperma Woodland   Pinus flexilis / Juniperus scopulorum Woodland   Pinus flexilis / Purshia tridentata Woodland		Names:   UID: ELEMENT_GLOBAL.2.899547 NatureServe Explorer   Code: A3424   Translated: Limber Pine / Shrub Understory Central Rocky Mountain Woodland Alliance   Common: Central Rocky Mountain Limber Pine / Shrub Woodland   Scientific: Pinus flexilis / Shrub Understory Central Rocky Mountain Woodland Alliance