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Artemisia arbuscula ssp. arbuscula - Purshia tridentata / Pseudoroegneria spicata - Festuca idahoensis Shrub Herbaceous Vegetation | Western Ecology Working Group of...
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Name: Artemisia arbuscula ssp. arbuscula - Purshia tridentata / Pseudoroegneria spicata - Festuca idahoensis Shrub Herbaceous Vegetation Reference: Western Ecology Working Group of... Description: Artemisia arbuscula and Purshia tridentata are the dominant shrubs with Chrysothamnus viscidiflorus and Ericameria nauseosa (= Chrysothamnus nauseosus) being minor components. This association usually occurs on side and toe slopes on north, northeastern and eastern aspects at elevations from 4500-5000 feet. Slopes are gently sloping to nearly level, ranging from 0-5%. Bare ground is 50-75% of ground cover. Stones and gravel cover less than 10% of the surface. Soils are moderately well-drained. Pseudoroegneria spicata and Festuca idahoensis are the dominant grasses, with Achnatherum thurberianum, Elymus elymoides, Poa secunda, Koeleria macrantha and the non-native Bromus tectorum commonly found. Important forbs include Astragalus sp., Erigeron sp., and Lomatium triternatum. The Chrysothamnus species and Bromus tectorum increase with grazing intensity. Normally in central Oregon, Purshia tridentata and Artemisia arbuscula would not be growing together since Purshia tridentata requires a considerably deeper and better drained soil than does Artemisia arbuscula. Tests indicate that the two species are growing on distinct microsites. Artemisia arbuscula grows in areas that have a layer restrictive to roots approximately 15-20 inches deep, and Purshia tridentata occurs on sites where this restrictive layer does not occur. The scattered distribution of the two shrubs reflects an underlying distribution of soil condition. Silica has been identified as the major cementing agent that restricts drainage and root penetration on the Artemisia arbuscula sites.  Accession Code: VB.CC.25802.ARTEMISIAARBUSC 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: Artemisia arbuscula ssp. arbuscula Shrub Herbaceous Alliance This Community's Level: Association This Community's Children: [none]		Names:   Translated: Dwarf Sagebrush - Bitterbrush / Bluebunch Wheatgrass - Idaho Fescue Shrub Herbaceous Vegetation   UID: ELEMENT_GLOBAL.2.689474 NatureServe Explorer   Code: CEGL001518   Scientific: Artemisia arbuscula ssp. arbuscula - Purshia tridentata / Pseudoroegneria spicata - Festuca idahoensis Shrub Herbaceous Vegetation (convergence) and Synonyms: (undetermined) Artemisia arbuscula ssp. arbuscula - Purshia tridentata / Pseudoroegneria spicata - Festuca idahoensis Shrub Herbaceous Vegetation