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Purshia tridentata / Poa secunda Shrubland | NatureServe Biotics 2019
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Name: Purshia tridentata / Poa secunda Shrubland
Reference: NatureServe Biotics 2019
Description: This type has been described from extreme southeastern Idaho, in Caribou County, in Soda Springs valley. The dominant is the 1- to 2-m tall, broad-leaved deciduous shrub <i>Purshia tridentata</i>. The understory apparently has an unusual assemblage of herbaceous species, with the perennial bunchgrass <i>Poa secunda</i> the most diagnostic species. This type occurs in the foothills of a small mountain range in a semi-arid region. This region is characterized by thrust faulting, with north/south-trending ranges and intervening broad, gentle valleys. The association occurs on a gently sloping valley-side at approximately 1870 m (6140 feet) elevation. Formation Spring emanates from the base of the Aspen Range and flows across the valley floor for about 1 mile, where it then sinks into the porous substrate. The water of the spring is supersaturated with very pure calcium carbonate (CaCO2), and extensive deposits of travertine have precipitated out of solution along the course of the spring water. The water flow has been continuously changed by damming action resulting from the travertine deposition. This process has occurred over thousands of years and has resulted in many features, including active and inactive (dry) rimmed pools that have built up to a depth of 3.6 m (12 feet), and level, barren plains. This plant association occurs away from the high water table along the creek, in the inactive, dry travertine pools. 
Accession Code: urn:lsid:vegbank.org:commConcept:29968-{D01A0722-26FF-410E-B477-E6896ADD5D2C}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 15-Nov-1993 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.688143 NatureServe ExplorerNatureServe Explorer logo
  Code: CEGL001059
  Translated: Antelope Bitterbrush / Sandberg Bluegrass Shrubland
  Scientific: Purshia tridentata / Poa secunda Shrubland
(convergence) and Synonyms:
(similar) CEGL001059
(similar) Purshia tridentata / Poa secunda Shrubland
(similar) Purshia tridentata / Poa secunda Shrubland