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Agropyron cristatum Western Ruderal Perennial Grassland Alliance | NatureServe Biotics 2019
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Name: Agropyron cristatum Western Ruderal Perennial Grassland Alliance Reference: NatureServe Biotics 2019 Description: This ruderal perennial grassland alliance occurs in the interior western U.S. The vegetation is strongly dominated (&gt;90% relative canopy cover) by invasive, exotic perennial grasses, especially <i>Agropyron cristatum</i>, which can occur as a near-monoculture or mixed grassland with other exotic perennial species such as <i>Poa pratensis</i>, and exotic perennial forbs and annuals. <i>Agropyron cristatum</i> has been purposefully seeded to prevent soil erosion and provide livestock forage in many areas and has naturalized outside these plantings. Scattered shrubs may be present but have low cover (&lt;10% absolute cover). Native perennial graminoid species may be present but cover is low (&lt;10% relative cover). Highly invasive and wind- and animal-distributed exotic forb and annual grass species may be present, including <i>Sisymbrium altissimum, Descurainia sophia, Halogeton glomeratus</i>, and <i>Salsola tragus</i>. Although exotic forbs and annual grasses may be abundant in the herbaceous layer and contribute to its ruderal nature, exotic perennial graminoids characterize the site. Stands occur in disturbed dry to mesic basins, alluvial fans, and foothills at elevations up to 2200 m throughout the cool, semi-arid interior western U.S. Vegetation dominated by relatively mesic, invasive perennial hay grasses such as <i>Bromus inermis, Dactylis glomerata, Phleum pratense</i>, and <i>Poa pratensis</i> generally occurs at higher elevations, higher latitudes or mesic microsites such as north slopes and generally has a more temperate climate and relatively mesic site conditions.  Accession Code: urn:lsid:vegbank.org:commConcept:39347-{AB476CFA-8D53-47EC-8D3D-E99ADE594E5D} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 18-Dec-2014 to: ongoing
	status: accepted Community's Parent: Great Basin-Intermountain Ruderal Dry Shrubland & Grassland Group This Community's Level: Alliance This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.935020 NatureServe Explorer   Code: A4148   Translated: Crested Wheatgrass Western Ruderal Perennial Grassland Alliance   Common: Western Ruderal Crested Wheatgrass Grassland   Scientific: Agropyron cristatum Western Ruderal Perennial Grassland Alliance