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A.1242 | EcoArt 2002
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Name: A.1242 Reference: EcoArt 2002 Description: This grassland alliance occurs on the Columbia River plains and in the Centennial Valley Sandhills in southwestern Montana. Elevations range 300-765 m along the Columbia River. Sites are level to moderately sloping sandy plains and dunes. Soils are deep loess or sandy soils in Washington and sand in Montana, where stands are found in a patchwork with sand dunes and dune shrublands with occurrences less than one acre in size. Disturbance is important to the maintenance of these seral communities, and it is associated with recent blowouts. These sparse grasslands are usually dominated by ~Elymus lanceolatus$, which is a cool-season, rhizomatous perennial grass that binds the loose sand providing 1-20% cover. The bunchgrass ~Hesperostipa comata (= Stipa comata)$ and the perennial forb ~Phacelia hastata$ are codominant in some stands. Other species that may be present include grasses, such as ~Achnatherum hymenoides (= Oryzopsis hymenoides), Poa secunda$, and forbs like ~Astragalus sclerocarpus, Eriogonum ovalifolium, Linum perenne, Psoralidium tenuiflorum (= Psoralea tenuiflora), Oenothera pallida, Achillea millefolium$, and ~Phlox longifolia$. Very scattered patches of 1- to 2-m tall shrubs occasionally occur, including evergreen and deciduous species such as ~Artemisia tridentata, Ericameria nauseosa (= Chrysothamnus nauseosus), Tetradymia canescens$, and ~Purshia tridentata$. Non-native species include ~Bromus tectorum, Centaurea diffusa, Sisymbrium altissimum$, and ~Salsola kali$, and are common on the Columbia Basin stands. Diagnostic of this alliance is an open grassland dominated by ~Elymus lanceolatus$ that occurs in disturbed sandy areas.  Accession Code: VB.CC.1008.A1242 Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 17-Mar-2005
	status: accepted Community's Parent: V.A.5.N.c This Community's Level: Alliance This Community's Children: [none]		Names:   Code: A.1242   Scientific: ELYMUS LANCEOLATUS HERBACEOUS ALLIANCE   Common: Streamside Wild Rye Herbaceous Alliance (convergence) and Synonyms: (undetermined) Elymus lanceolatus Herbaceous Alliance