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A.1271 | EcoArt 2002
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Name: A.1271
Reference: EcoArt 2002
Description: Grasslands included in this alliance have been described only in the Uinta Basin of Utah. Stands occur above the Pinyon-Juniper Community in the Mid-Altitude ~Artemisia$ and in the Upper Altitude Communities. Elevations range from approximately 1800-2600 m. These grasslands form in openings on the slopes and benches in the shrublands and lower elevation forests. Climate is semi-arid with mean annual precipitation ranging from 22-35 cm. Summers are hot and winter are cold with below freezing temperature common. These grasslands are in a matrix of ~Artemisia tridentata$-dominated shrublands, ~Pinus edulis$ and ~Juniperus osteosperma$ woodland at lower elevations, and ~Populus tremuloides$ forests at higher elevations. Grasslands in this alliance occur in a mosaic with shrublands on submontane slopes and benches in the Uinta Basin of Utah. Stands have a moderately dense cover of graminoids codominated by the cool-season, perennial bunch grasses ~Achnatherum nelsonii (= Stipa nelsonii)$ and ~Koeleria macrantha$. Other graminoids may include ~Aristida purpurea, Juncus$ spp., ~Poa$ spp., ~Achnatherum hymenoides (= Oryzopsis hymenoides), Pascopyrum smithii$, and ~Hesperostipa comata (= Stipa comata)$. Scattered shrubs and dwarf-shrubs are typically present, such as ~Artemisia tridentata, Ericameria nauseosa (= Chrysothamnus nauseosus), Dasiphora fruticosa ssp. floribunda (= Pentaphylloides floribunda)$, and ~Purshia tridentata$. The sparse forb layer may include species of ~Aster, Astragalus, Delphinium, Polygonum$, and the exotic ~Taraxacum officinale$. 
Accession Code: VB.CC.1040.A1271
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.d
  • This Community's Level: Alliance
  • This Community's Children: [none]
Names:   Scientific: ACHNATHERUM NELSONII HERBACEOUS ALLIANCE
  Code: A.1271
  Common: Nelson's Needlegrass Herbaceous Alliance
(convergence) and Synonyms:
(undetermined) Achnatherum nelsonii Herbaceous Alliance