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Achnatherum nelsonii Herbaceous Alliance | Western Ecology Working Group of...
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Name: Achnatherum nelsonii Herbaceous Alliance Reference: Western Ecology Working Group of... 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 Asteraceae, Astragalus, Delphinium, Polygonum, and the exotic Taraxacum officinale.  Accession Code: VB.CC.24833.ACHNATHERUMNELS 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: Achnatherum nelsonii Herbaceous Alliance   Translated: Nelson's Needlegrass Herbaceous Alliance   UID: HIGHER_CLASS_UNIT.2.124642 NatureServe Explorer   Code: A.1271