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Leymus cinereus Herbaceous Alliance | Western Ecology Working Group of...
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Name: Leymus cinereus Herbaceous Alliance Reference: Western Ecology Working Group of... Description: This grassland alliance occurs in the Intermountain West of the U.S. Sites are often gentle to moderate slopes on any aspect. Stands are found on relatively mesic, non-flooded sites such as terraces above the seasonal floodplain, uplands from toeslopes to the shoulder of the slope, broad valleys, mesic patches in semi-arid shrublands and seepage sites. Sites are relatively mesic; some have soils saturated with snowmelt, while others are subirrigated. Soils are typically deep, fine-textured, alkaline, and sometimes saline, derived from alluvium and colluvium. Vegetation included in this alliance is characterized by a sparse to dense herbaceous layer that is dominated by the tall bunchgrass Leymus cinereus. Other plants are found mainly between the clumps of Leymus cinereus or on the edges of the stand. Characteristic graminoids include Festuca idahoensis, Pascopyrum smithii, Carex praegracilis, Poa secunda (= Poa juncifolia), and Puccinellia distans. The forb layer is sparse to moderately dense with perennial species such as Achillea millefolium, Antennaria microphylla, Aquilegia spp., Astragalus spp., Cirsium spp., Frasera speciosa, Pyrrocoma uniflora (= Haplopappus uniflorus), or Castilleja spp. Scattered shrubs may also be present. Sparse annual forbs and grasses are seasonally present. Leymus cinereus is salt-tolerant, and saline sites include the more salt-tolerant species like Pascopyrum smithii or Puccinellia distans. Diagnostic of this alliance is the Leymus cinereus-dominated grassland.  Accession Code: VB.CC.18331.LEYMUSCINEREUSH Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 01-May-2019
	status: accepted This Community's Level: Alliance This Community's Children: [none]		Names:   Scientific: Leymus cinereus Herbaceous Alliance   Translated: Great Basin Lyme Grass Herbaceous Alliance   UID: HIGHER_CLASS_UNIT.2.125929 NatureServe Explorer   Code: A.1204