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Juniperus occidentalis Woodland Alliance | Western Ecology Working Group of...
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Name: Juniperus occidentalis Woodland Alliance Reference: Western Ecology Working Group of... Description: This woodland alliance is widely distributed along the northern and western margins of the Great Basin, from southwestern Idaho to southern California. Stands are found on all aspects and slope positions, but are restricted to rock outcrops or escarpments with excessively drained soils where it grades into relatively mesic forests or grassland habitats. Soils are variable, but generally medium-textured, with abundant coarse fragments, and derived from volcanic parent materials. An open tree canopy that is dominated by Juniperus occidentalis characterizes vegetation included in this woodland alliance. Scattered emergent individuals of Pinus ponderosa and/or Pinus jeffreyi may be present in areas transitional to conifer forests. At such sites, Cercocarpus ledifolius, a tall shrub or small tree, may codominate the canopy. Quercus garryana may also be present in the tree layer. The shrub layer is variable in density and species composition. The most common shrub is Artemisia tridentata. Other shrubs that commonly occur are Purshia tridentata, Ericameria nauseosa (= Chrysothamnus nauseosus), Chrysothamnus viscidiflorus, Ribes cereum, and Tetradymia spp. Less common, but locally abundant shrubs include Prunus emarginata, Grayia spinosa (= Atriplex spinosa), and Ribes velutinum. The herbaceous layer is usually composed of annual and perennial grasses such as Pseudoroegneria spicata, Festuca idahoensis, Koeleria macrantha, Poa spp., and Stipa spp. Common forb species include Achillea millefolium, Collinsia parviflora, Eriophyllum lanatum, and Gayophytum diffusum. Diagnostic of this alliance is the Juniperus occidentalis-dominated tree layer with over 25% cover.  Accession Code: VB.CC.17773.JUNIPERUSOCCIDE 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: Juniperus occidentalis Woodland Alliance   Translated: Western Juniper Woodland Alliance   UID: HIGHER_CLASS_UNIT.2.126242 NatureServe Explorer   Code: A.535