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Purshia tridentata / Achnatherum hymenoides Shrubland | Western Ecology Working Group of...
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Name: Purshia tridentata / Achnatherum hymenoides Shrubland Reference: Western Ecology Working Group of... Description: A narrowly restricted community in Washington, it is found in isolated sand dune landscapes in Franklin, Grant, Yakima, Klickitat, and Benton counties. This community occurs in Oregon and Idaho as well. It is confined to sand dunes within the shrub-steppe zone in the driest and hotter parts of the Columbia Basin. This is a patchy vegetation with sparse to dense cover concentrated in two lifeforms: medium-tall shrubs and herbaceous plants. Purshia tridentata, typically 2-3 feet tall, dominates portions of these communities and is completely absent in other portions. Artemisia tridentata and/or Chrysothamnus viscidiflorus or Ericameria nauseosa (= Chrysothamnus nauseosus) are usually present. All shrubs increase with intermittent disturbance. Achnatherum hymenoides (= Oryzopsis hymenoides), a bunchgrass, and Elymus lanceolatus, a rhizomatous grass, are the most conspicuous perennial grasses on dunes. Hesperostipa comata (= Stipa comata), Koeleria macrantha, or Poa secunda often appear in the deflation plains between dunes. Eriogonum niveum is a common but scattered feature of this community especially where gravel is present. Psoralidium lanceolatum, Oenothera pallida, Pteryxia terebinthina, and Rumex venosus are usually present but contribute little to total community cover. Exotic annuals, such as Bromus tectorum and Salsola kali, can be common.  Accession Code: VB.CC.20544.PURSHIATRIDENTA Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 17-Nov-2014
	status: accepted Community's Parent: Purshia tridentata Shrubland Alliance This Community's Level: Association This Community's Children: [none]		Names:   Translated: Bitterbrush / Indian Ricegrass Shrubland   UID: ELEMENT_GLOBAL.2.685501 NatureServe Explorer   Code: CEGL001058   Scientific: Purshia tridentata / Achnatherum hymenoides Shrubland (convergence) and Synonyms: (undetermined) Purshia tridentata / Achnatherum hymenoides Shrubland