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Danthonia unispicata - Poa secunda Herbaceous Vegetation | Western Ecology Working Group of...
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Name: Danthonia unispicata - Poa secunda Herbaceous Vegetation Reference: Western Ecology Working Group of... Description: This grassland association occurs in scablands of the Snake River plain in northeastern Oregon and likely occurs in Washington. It has also been reported from Wyoming, but information is not available. Stands are found on dry, level to undulating plateau and ridgetops at elevations of 1130-1830 m. This association is restricted to less xeric sites, such as slightly concave or seep areas where there is supplementary soil moisture. Vernal pools are not uncommon in this type. Soils are shallow (7-25 cm), rocky (40-60% coarse fraction) loams that are derived from basalt and loess. These soils are underlain by non-fractured basalt bedrock. The soil surface is stabilized by high cover of rock and moss. During the winter, these soils are often saturated. Disturbance from frost boils is common. The bedrock in not fractured and therefore cannot support deeper-rooted bunch grasses such as Pseudoroegneria spicata and Festuca idahoensis, or shrubs. This association has a sparse to moderately dense herbaceous layer codominated by the perennial graminoids, Poa secunda and Danthonia unispicata. The Danthonia unispicata often occurs in patches where soil moisture accumulates. Common forbs may include Antennaria spp., Balsamorhiza incana, Sedum spp., Lomatium spp., Erigeron chrysopsidis, Polygonum spp., and Trifolium macrocephalum. Stands may form a mosaic with drier sites dominated by Poa secunda without Danthonia unispicata, and areas with fractured bedrock with an open canopy of the dwarf-shrub Artemisia rigida.  Accession Code: VB.CC.22734.DANTHONIAUNISPI 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 Herbaceous Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.686576 NatureServe Explorer   Translated: Few-flower Wild Oatgrass - Curly Bluegrass Herbaceous Vegetation   Code: CEGL001783   Scientific: Danthonia unispicata - Poa secunda Herbaceous Vegetation (convergence) and Synonyms: (undetermined) Danthonia unispicata - Poa secunda Herbaceous Vegetation