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Poa secunda Herbaceous Alliance | Western Ecology Working Group of...
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Name: Poa secunda Herbaceous Alliance Reference: Western Ecology Working Group of... Description: This grassland alliance is found in the scablands east of the Cascade Range 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.19383.POASECUNDAHERBA 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: Poa secunda Herbaceous Alliance   Translated: Curly Bluegrass Herbaceous Alliance   UID: HIGHER_CLASS_UNIT.2.126415 NatureServe Explorer   Code: A.1291