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Eriogonum thymoides / Poa secunda Dwarf-shrub Herbaceous Vegetation | Western Ecology Working Group of...
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Name: Eriogonum thymoides / Poa secunda Dwarf-shrub Herbaceous Vegetation Reference: Western Ecology Working Group of... Description: This plant association is most commonly observed in east-central Washington, though it is disjunct in southwestern Idaho, and may occur in Wyoming. It is restricted to shallow silt loam and stony loam lithosolic soil underlain by basalt. It commonly forms a mosaic with Artemisia rigida / Poa secunda Shrub Herbaceous Vegetation (CEGL001528) and other Eriogonum spp.-dominated types (e.g., Eriogonum strictum / Poa secunda Dwarf-shrub Herbaceous Vegetation (CEGL001788)) with which it may intergrade. The association is characterized by the presence of the low-shrub Eriogonum thymoides (with up to about 15% cover) over a ground layer of Poa secunda (with up to about 40% cover). Perennial forbs, especially Allium spp., Lomatium spp., Phlox hoodii, Stenotus stenophyllus, and Viola beckwithii, are common. The association lacks Artemisia rigida but may include significant amounts of Eriogonum douglasii or Eriogonum sphaerocephalum growing with the indicator species Eriogonum thymoides. This plant association is described for the Columbia Plateau of southeastern Washington. Stands are also known from the upper Hells Canyon in Idaho. The association occurs on basalt Lithosol sites ranging in elevation of 2100-3100 feet on the Columbia Plateau and 3200-4100 feet in the upper Hells Canyon region. Stands are relatively open. Eriogonum thymoides dominates the dwarf-shrub canopy. Poa secunda is consistently the most abundant grass species; Elymus elymoides is typically also present. Perennial forbs are diverse and varied. Particularly constant forbs include Antennaria flagellaris, Lithophragma glabrum (= Lithophragma bulbiferum), Lewisia rediviva, and Phoenicaulis cheiranthoides.  Accession Code: VB.CC.19436.ERIOGONUMTHYMOI Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 17-Nov-2014
	status: accepted Community's Parent: Poa secunda Dwarf-shrub Herbaceous Alliance This Community's Level: Association This Community's Children: [none]		Names:   Translated: Thymeleaf Wild Buckwheat / Curly Bluegrass Dwarf-shrub Herbaceous Vegetation   UID: ELEMENT_GLOBAL.2.684414 NatureServe Explorer   Code: CEGL001449   Scientific: Eriogonum thymoides / Poa secunda Dwarf-shrub Herbaceous Vegetation (convergence) and Synonyms: (undetermined) Eriogonum thymoides / Poa secunda Dwarf-shrub Herbaceous Vegetation