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Purshia tridentata Shrub Tall Herbaceous Alliance | Western Ecology Working Group of...
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Name: Purshia tridentata Shrub Tall Herbaceous Alliance Reference: Western Ecology Working Group of... Description: Vegetation in this alliance has only been reported from southern Idaho in a region of relatively recent 'plains' volcanic activity. The elevation where the alliance is found is roughly 1760 m. The region is semi-arid with annual precipitation ranging from 25-40 cm, falling in a bimodal pattern with winter and late spring peaks. The area is under a continental temperature regime of cold winters, hot summers, and a large diurnal variation. This alliance is found on medium-aged and older cinder cones. The weathering of these cinder deposits has proceeded far enough that water-holding capacity is increased over younger cinder deposits, which are dominated by Eriogonum ovalifolium. In general, this alliance is associated with coarse, well-drained soils. A canopy of Purshia tridentata characterizes these shrublands. Other important shrubs include Ericameria nauseosa (= Chrysothamnus nauseosus), Eriogonum heracleoides, Ribes cereum, Symphoricarpos oreophilus, and Artemisia tridentata ssp. vaseyana. The herbaceous layer is usually dominated by perennial bunch grasses, including Leymus cinereus, Pseudoroegneria spicata, and Festuca idahoensis. Associated forbs include Arabis holboellii, Balsamorhiza sagittata, Eriogonum umbellatum, Pteryxia terebinthina (= Cymopterus terebinthinus), and Lithospermum ruderale. Adjacent vegetation is typically Artemisia steppe, Pseudoroegneria - Poa - Festuca grasslands, or Pinus flexilis woodlands.  Accession Code: VB.CC.21125.PURSHIATRIDENTA 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: Purshia tridentata Shrub Tall Herbaceous Alliance   Translated: Bitterbrush Shrub Tall Herbaceous Alliance   UID: HIGHER_CLASS_UNIT.2.126154 NatureServe Explorer   Code: A.1517