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A.1291 | EcoArt 2002
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Name: A.1291
Reference: EcoArt 2002
Description: This grassland alliance is found in the scablands east of the Cascade Mountains in the Columbia Basin and portions of the Snake River plain. Elevation ranges from 300-2120 m. Precipitation primarily occurs in the winter as snow or rain, and this moisture is stored in the soil profile and utilized during the typically dry summers. Stands occur on flat to undulating ridgetops, plateaus, plains, and benches on steep canyon slopes. Sites are flat to moderately steep slopes on all aspects, but most common on southern exposures. Stands also occur in soil pockets between rocks on cliffs lining the sides of ravines. Soils are typically shallow, moderately to well-drained, non-calcareous with a high percentage of rock fragments and exposed rock (lithic), and texture varies from sandy loam to clay loam. Rock and moss cover significant amounts of the ground surface often with over 40% cover of each. Vegetation included in this alliance is characterized by the dominance of ~Poa secunda$. Codominant species may include mid grasses such as ~Aristida purpurea var. longiseta, Danthonia unispicata$, and the forbs ~Balsamorhiza serrata$ and ~Lomatium cous$. Other associated species may include ~Elymus elymoides, Sporobolus cryptandrus, Hesperostipa comata (= Stipa comata), Achillea millefolium, Antennaria$ spp., ~Balsamorhiza incana, Erigeron$ spp., ~Phlox longifolia, Sedum$ spp., ~Trifolium macrocephalum$, and ~Plantago patagonica$. Diagnostic of this alliance is the short graminoid layer dominated by ~Poa secunda$. 
Accession Code: VB.CC.1061.A1291
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 26-Nov-1997 to: 17-Mar-2005
     
  • status: accepted
  • Community's Parent: V.A.5.N.f
  • This Community's Level: Alliance
  • This Community's Children: [none]
Names:   Scientific: POA SECUNDA HERBACEOUS ALLIANCE
  Code: A.1291
  Common: Curly Bluegrass Herbaceous Alliance
(convergence) and Synonyms:
(undetermined) Poa secunda Herbaceous Alliance