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Leymus cinereus Intermittently Flooded Herbaceous Alliance | Western Ecology Working Group of...
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Name: Leymus cinereus Intermittently Flooded Herbaceous Alliance Reference: Western Ecology Working Group of... Description: This grassland alliance occurs throughout much of the Great Basin and Columbia River Basin. Elevations range from 1400-3000 m. Climate is semi-arid, temperate and continental. Sites are nearly level to gently sloping occurring on all aspects. Stands are restricted to intermittently flooded habitats such as playas, intermittent streams and dry washes. Flooding is not predictable to a given season and is dependent upon localized rainstorms. Some stands within this alliance are apparently restricted to permanently saturated soils, and saline or alkaline soils with a shallow water table are typical of most stands. Soils are typically moderately deep silts and clays, and the soil surface often has high cover of bare ground. Vegetation is characterized by a sparse to dense herbaceous layer dominated by tall and medium-tall graminoids (<1.5 m tall). The tall bunchgrass Leymus cinereus is the sole or dominant grass. Other graminoids may include Distichlis spicata, Pascopyrum smithii, Carex praegracilis, Elymus elymoides, Hordeum jubatum, Achnatherum hymenoides (= Oryzopsis hymenoides), Pseudoroegneria spicata, Poa secunda, Hesperostipa comata (= Stipa comata), or Achnatherum thurberianum (= Stipa thurberiana). There is often sparse to moderate cover of perennial forbs such as Achillea millefolium, Crepis runcinata, and Potentilla gracilis var. fastigiata (= Potentilla gracilis var. nuttallii). The emergent shrub Ericameria nauseosa (= Chrysothamnus nauseosus) may be scattered within the stand. Claytonia perfoliata (= Montia perfoliata) and Suaeda sp. are common native annual forbs, but exotics typically make up the majority of annuals present. Diagnostic of this alliance is the medium-tall grassland dominated by Leymus cinereus that is restricted to lowland sites that are flooded intermittently.  Accession Code: VB.CC.22619.LEYMUSCINEREUSI 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 Intermittently Flooded Herbaceous Alliance   Translated: Great Basin Lyme Grass Intermittently Flooded Herbaceous Alliance   UID: HIGHER_CLASS_UNIT.2.124765 NatureServe Explorer   Code: A.1329