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Pinus monophylla - Juniperus osteosperma Grassy Open Woodland Alliance | NatureServe Biotics 2019
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Name: Pinus monophylla - Juniperus osteosperma Grassy Open Woodland Alliance
Reference: NatureServe Biotics 2019
Description: These open woodlands and tree savannas are characterized by diagnostic tree species <i>Pinus monophylla</i> which forms an open to moderately dense tree layer often with <i>Juniperus osteosperma</i> or, less frequently, <i>Juniperus californica</i> in southern California. <i>Juniperus osteosperma</i> may also dominate stands as long as there is significant presence of <i>Pinus monophylla</i> that characterizes the stand as a pinyon-juniper stand and not the more xeric, typically lower elevation ~<i>Juniperus osteosperma</i> Great Basin Shrubby Woodland Alliance (A4370)$$. At higher elevations and on relatively mesic sites, such as along drainages, <i>Juniperus scopulorum</i> may be present and sometimes dominant. Other conifers are absent or accidental with very low cover. The understory is characterized by an open to dense herbaceous layer. Scattered shrubs may be present but do not form a layer and do not exceed cover of herbaceous layer. Perennial grasses typically dominate the herbaceous layer, although forbs species are present and can be diverse. Characteristic species include <i>Achnatherum hymenoides, Bouteloua gracilis, Elymus elymoides, Hesperostipa comata, Leymus cinereus, Pleuraphis jamesii, Poa fendleriana, Poa secunda</i>, and <i>Pseudoroegneria spicata</i>. The non-native, invasive annual grass <i>Bromus tectorum</i> may become abundant and dominate the understory of highly disturbed stands. This open woodland and savanna alliance occurs on dry mountain ranges of the Great Basin region and eastern foothills of the Sierra Nevada, and south in scattered locations throughout southern California, including desert mountain ranges. Stands occur on warm, dry sites on mountain slopes, foothills, plateaus and ridges in ranges of the Great Basin and southern California, usually on erosional terrain or upper alluvial slopes. Elevations range from 1000 to 2800 m. The climate is semi-arid, with approximately 20-45 cm of precipitation annually. Substrates are variable but often rocky with shallow soil. 
Accession Code: urn:lsid:vegbank.org:commConcept:38340-{E62BE574-003E-4CE8-A40A-34FCD1210384}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 14-Mar-2014 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.858280 NatureServe ExplorerNatureServe Explorer logo
  Code: A2109
  Translated: Singleleaf Pinyon - Utah Juniper Grassy Open Woodland Alliance
  Common: Great Basin Singleleaf Pinyon - Utah Juniper Grassy Open Woodland
  Scientific: Pinus monophylla - Juniperus osteosperma Grassy Open Woodland Alliance