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Juniperus occidentalis Wooded Herbaceous Alliance | Western Ecology Working Group of...
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Name: Juniperus occidentalis Wooded Herbaceous Alliance Reference: Western Ecology Working Group of... Description: Stands of this alliance are widely distributed along the northern and western margins of the Great Basin, from southwestern Idaho to northeastern California, from 200 m to over 1500 m elevation. Throughout the range the climate is semi-arid, with 23-36 cm of precipitation annually. Most of the precipitation is winter rain. The temperature regime is cool summer-continental, with a wide range in diurnal temperatures and night frosts through most of the year. Summer lightning storms and associated fires are common in the environments where this type occurs and are presumably important in structuring the vegetation. Generally soils are medium-textured, with abundant coarse fragments, and derived from volcanic parent materials. In central Oregon, the center of its range, vegetation of this alliance is found on all aspects and slope positions. Vegetation within this alliance is usually characterized by a sparse overstory of Juniperus occidentalis. Cercocarpus ledifolius, a tall shrub or small tree, may also be common. Other shrubs which commonly occur in these woodlands are Purshia tridentata, Ericameria nauseosa (= Chrysothamnus nauseosus), Chrysothamnus viscidiflorus, Ribes cereum, and Artemisia rigida, Artemisia arbuscula or Artemisia tridentata. The herbaceous layer is usually comprised of annual and perennial grasses such as Pseudoroegneria spicata, Festuca idahoensis, Poa secunda, Koeleria macrantha, and Stipa spp. Common forbs include Achillea millefolium, Balsamorhiza spp., and Trifolium macrocephalum. Adjacent vegetation is most commonly Pinus ponderosa forests, Juniperus occidentalis woodlands, or Artemisia steppe.  Accession Code: VB.CC.18365.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 Wooded Herbaceous Alliance   Translated: Western Juniper Wooded Herbaceous Alliance   UID: HIGHER_CLASS_UNIT.2.124927 NatureServe Explorer   Code: A.1500